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As someone who has owned an Olympus OM-D E-M5, and also recently bought both a Fujifilm X-T1 and a Pentax K-S2, I think I have a pretty good basis of experience for answering this.
First: All of these are good cameras. None of these companies are selling junk nowadays.
In terms of value, or "bang for buck", nobody can touch Pentax right now. On eBay I payed more for a used and slightly scuffed X-T1 with a few bits missing (like the flash unit!) than I paid for the brand new K-S2 at retail. And, in some ways the K-S2 is a higher-specified camera, with a slightly better sensor and in-body stabilization. This same observation applies to lenses. Fuji lenses are exquisite, but you will get sticker shock, and you don't have a very broad catalog to choose from.
The biggest difference in usage and shooting experience is OVF versus EVF. The X-T1 has a huge and high-definition EVF that overlays lots of useful information. The "exposure preview" functionality means you're seeing an approximation of the image the camera will actually capture, including the effects of all your camera settings. It also can display some very helpful focusing aids, such as magnification, split image and focus peaking. It's lovely. However, I find it somewhat dim when I'm out in bright sunlight. It's never what I would call unusable, but even with the EVF brightness dialed up to maximum, the view becomes kind of dark and ugly. (The LCD EVF if in the Olympus was somewhat brighter than the OLED EVF in the Fuji, by the way, but inferior in other regards.)
By comparison, the K-S2 has one of the brightest and clearest pentaprism viewfinders I've ever seen. It's lovely and beautiful on bright sunny days. There's no obvious indication if the camera is mis-metering the scene in any way, though. If I am shooting RAW and importing into Lightroom, then it hardly matters. Those files have so much leeway for adjustment that it almost seems like there's no such thing as a badly exposed image. They're all fixable. (And it's convenient that the Pentax can save in DNG format!) With JPEG it may be a different story. Manual focusing with the K-S2 is hit-or-miss. The OVF is crisp enough to make you think, if you have acute vision, that you've nailed the focus, only to find out later that you did not. Its focusing aids are minimal and crude, both in the OVF (basic focus confirmation) and LCD (focus peaking with no adjustments). If you have enough time, you can magnify live view on the LCD, but manual focusing is not the K-S2's strength. At all.
Form factor. . . The K-S2 is reputedly the smallest weather-sealed DSLR. (The K-S1, with no weather sealing, is slightly smaller and a fair bit lighter but is reputed to suffer from shutter shock in some situations). For somebody who's been using mirrorless cameras for a while, the K-S2 seemed huge and felt at first like a boat anchor in my hand. However, it's mostly due to the thick and hand-filling DSLR "pistol grip", which is more a matter of familiarity and preference. In terms of fitting into a camera bag, which is what really matters the most (IMHO), either the K-S2 or the X-T1 fit into the same space in my ONA Bowery bag, plus room for two additional lenses -- as long as those lenses aren't excessively large. The Olympus system was somewhat more compact, but not really dramatically so. (For portability nothing can touch the Pentax Q7 anyhow!)
The tilt screen on the E-M5 and X-T1 is more convenient than the swivel screen of the K-S2. However, the K-S2's screen can be turned inward for protection. I've broken the screen on the E-M5 twice.
The E-M5 and X-T1 and K-S2 are all "weather sealed". Only Pentax has a reputation for being dragged through the swamps and the rain and mud, dust and sand, and snow and ice without missing a beat, though.
Both the Olympus and Fuji seem to me like mixed bags: brilliant in some ways, but also with unexpected pitfalls. IMHO the K-S2 is a well-balanced package with fewer "wow" features, but not many hidden pitfalls either.
So, maybe that's too much information? Let me boil it down if I can. . .
If you do a lot of manual focusing, the EVF is hard to beat. (And the Fuji, specifically, is hard to beat.)
If you do a lot of shooting outdoors in bright sunlight, and using autofocus, the Pentax DSLR is for you.
If size and weight are major factors in your mind, then Micro Four Thirds might be your best bet. (I've got to say, though, that I'm never giving up my Pentax Q7 kit!)
If you like to shoot raw and process in Lightroom, Pentax will provide the maximum convenience. If you like to shoot JPEG, then the exposure preview offered by an EVF may be valuable to you.
If you are moving from a camera with a thick grip (most DSLRs) to one with much smaller grip (most, but not all, mirrorless), or vice-versa, it will probably feel awkward at first. Most likely you can adjust if you give it a chance. Your hands are more versatile than you know.
If you drag your camera through the rain, mud, dust, etc., then the Pentax might give you more confidence.
I hope this helped!
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