Originally posted by ffking The D750 is a classic case of where a camera makes a big leap forward and gets (often justified) rave reviews at the time which are never modified as technology (fr instance sensors) improves, so when you compare and older camera with a newer one the older one tends to be over-rated by comparison - which isn't to say that it's a bad camera, just that (for instance), can it really be judged the same value for money as the K-1?
The D750 biggest issue (now solved maybe) was the light leaks. Other than that it sport better AF overall. This may not matter to everybody. Biz-engineer for example is trained enough to not care much and do well with K1. And for most people K1 AF is likely good enough.
Still 6.5FPS vs 4.5 on FF is significant improvement, K1 is as fast only in APSC mode and then you might as well get a D7100 or K3. The Nikon echosystem is much stronger. You get all the latest sigma/tamron lenses at sigma/tamron prices. Nikon has lot of lenses on top of that of professionnal quality. Because the lenses where there for years, you can find them used too (for example a Nikon 70-200 for 1150€ or 24-70 for $1000...)
In France the D750 is 25% cheaper than K1, so that almost a free lens to get for the price. Maybe a sigma 24-70 f/2.8 or 24-105 f/4...
The K1 will be better for landscapes, still shooting on a tripod (pixel shift...), that 100% true. But while a landscape with only 24MP can still quite successfully be print at any size without any problem, if the focus if off, you will just trash the photo of that action shoot. It might also be that there more pro photographers making money shooting event, people, sports were AF matter and high resolution doesn't than landscapes.
This of course is subjective. I still prefer FAltds for example and think K3 AF good enough so for me K1 would make more sense even if I find it doesn't fit my needd (I want smaller/lighter and a small 24mm prime as well as an EVF so if use digital zoom for reach I still get a clear view).