Originally posted by bwDraco So... I'll clarify that I'm moving towards nature and wildlife photography.
Keep in mind that wildlife is demanding, at least if we talk about BIF.
Originally posted by bwDraco As stated earlier, indoor sports photography is no longer a focus. Reduced size and weight, and high shooting performance, are key.
Then again, in my opinion "high shooting performance, are key" will be easier to achieve with D500, Sony A6600 or Fuji X-T3. Even Canon M6 Mark II will outperform E-M1 Mark II or E-M1X but it doesn't have native lenses and that's why I'm not suggesting it.
Originally posted by bwDraco From what I've read, the 20MP Four Thirds sensor is just about as good as the Pentax K-3 II's sensor despite the smaller size, though the pixel count is a bit lower.
Lower details than K-3 II and close in terms of high ISO. But K-3 II is not known as a high ISO camera. I had it and ISO wasn't something to talk about...
Originally posted by bwDraco Sony looks incredibly tempting to me. Exmor image sensors are the industry standard, and Sony's Real-Time Tracking AF technology is often considered to be the best available in any camera, reflex or mirrorless, but I'm not sure I want to buy into a full-frame system. Besides size and weight, Sony glass tends to be very expensive, more so than Canon and Nikon.
Sony A6600 has quite good tracking, has the support ot Tamron which has quite good lenses at good prices. And there is also Fuji which has good options in APS-C boat.
I would take a closer look to Fuji first, then Sony for mirrorless, or at Nikon D500/Canon 90D for DSLR. The 90D with 100-400mm L lens will also make an excelent combo, but you'll need to shoot more carefully with it due to the demanding 36mp sensor.
Originally posted by bwDraco It's still a very hard call to make. Perhaps I'll end up maintaining two mirrorless systems (Micro Four Thirds and Sony Alpha) and selling my Pentax kit? I don't know. For the time being, I still feel M4/3 is the best solution for my needs.
Draco
Why not wait to see how the new Pentax APS-C will look like? It can't be far away...
I'm not saying that Oly can't be the best choice for you, but try to rent it and shoot with it in some difficult scenarious.