As someone who has dumped his Pentax dsrs in favor of Fuji, I would offer the following comments:
Fuji--with its through the viewfinder focus peaking--allows for far more precise focusing with my manual focus K-mount lenses than I ever could achieve with either my K-7 or K-5. (I still own three Zeiss K-mount lenses, one Voigtlander, and two M lenses.)
Fuji has a 'signature' look that other cameras can not duplicate. The 'Fuji look' is a largely a result of its unorthodox sensor design. However, its color/film presets are also part of this. This look is not to everyone's liking, to be sure. But it appeals to many, and it does set the Fuji X-trans cameras apart from the rest.
The Fuji's resolution is easily equal to that of the K-5iis. (And not far behind the K-3.) However, from what I've been able to see on line, the Fuji may have the edge over *all* Pentax models in terms of high ISO/low noise.
The Fuji is much lighter than the top of the line Pentax cameras. This bothered me at first; however, I now see it as an advantage.
As someone who has owned (and still owns) some of the best Pentax glass ever made (the FA limiteds), I must say that Fuji beats Pentax hands down in this area. While I love both my 77mm and 43mm ltds (I sold my 31mm), my native Fuji glass (I own the 23, the 35, and the 60, with the 56 f1.2 on order), offers, to my eye, superior contrast and resolution to anything Pentax currently offers.
And, while it is a very personal thing, I much prefer the handling of the Fuji Xpro-1 over any Pentax dslr. (I find the Fujis 'knobs and dials' to be much more intuitive.)
Where does Pentax have the edge? Auto-focusing, weather sealing, and in camera shake-reduction to name a few areas Then there is the fact of the penta-prism viewfinder. However, the new Fuji XT-1 will have weather sealing; the auto-focusing system--while not up to the standards of Nikon and Canon dslrs--should not be too far behind Pentax (never known for its auto-focusing capabilities). So that makes (at least to my thinking) the trump card for Pentax its in-body SR. For some, the fact that Pentax provides a pentaprism 'real world' view is something that will always give it the edge. However, the Xpro 1 and the X100s doe offer an optical viewfinder in addition to the EVF.
I am not saying that Pentax dslrs aren't good cameras--they are VERY GOOD cameras. (In fact, I am sorely tempted to pick up a K-5iis at its current discount price.) And depending on the kind of shooting one does, it may be the best choice out there.
However, the Fuji X system far better serves my photographic needs than does Pentax. I am hanging on to my K mount glass because I still shoot a lot of film with my Pentax film bodies (and in hopes that Pentax comes up with a full-frame offering some day).
Still I hope that some folks who comment on this board would recognize the fact that Pentax cameras are--like Fuj cameras--for a certain type of shooter. "Horses for courses", as they say.
Every camera system is a trade-off; and this is something that is too often forgotten here.
Last edited by Byrd-2020; 02-06-2014 at 10:36 PM.