Why are you posting someone else's photos?
The exif is on those photos... he used a 70-200 at 200mm.. at 200 mm he wasn't right up on those cyclists, or he wouldn't have been shooting at full reach.
Why do you post things you know next to nothing about? Or do you actually talk to this guy. I mean you may be right in your analysis but you could also be wrong.
The FoV on the two images is the same 200mm D750 , 135 K-3
How did you determine that the D750 guy was in tighter and that the K-3 guy was way back using wide DoF? I don't know maybe you're right, but between posting other peoples pictures and talking about stuff you possibly know nothing about... so far, we have some images taken by a couple of guys we don't know.
That's like me doing this.... shooting this with a K20D is easy but doing it with a Nikon is a challenge.
It probably isn't true, and me posting a great picture taken with a K20D doesn't really prove a thing. And it's not my picture. But Bejikan left Pentax and was shooting with a D800 for a while, and now he's back to shooting his k20D for magazine layouts. SO I could argue a K20D is better than a D800. I won't, that's like the above argument. But, Benjikan posts here and if I really want to know, I can go in the K20D thread and ask him. These guys... not so much.
But I'll certainly argue that there's no guarantee that if you get a D800 you won't go back to your K20D. Obviously it has enough going for it, a D800 isn't the clear choice.
IN any case. I'd hate to see the forum degenerate to the point where people have to post other people's work to make a point. That's just wrong. Fact is, you have no idea if there'd been a K-3 shooter next to Fairedz he/she wouldn't have taken just as good or better pictures. And given the higher frame rate, he/she might have taken more of them. This is just idle speculation.
I won't be confusing it with fact.
Given that one of these guys is shooting with a system that probably cost between 3 and 4k and the other guy with a system that cost between 1 and 2 K, I'm not seeing what we should pay the extra money for. If we put those images up and say "which guy had the more expensive camera, or the camera with the best AF are people going to know?
And that is really the question, I'm not saying the K-3 is the same AF as the 750, there's lots of reasons to think it isn't. But when you get down to actually taking pictures. Is that something that makes a camera a better camera? I'd say, only if you're getting paid. If you're not getting paid, you'll get enough good images with your K-3 to keep you happy.