Originally posted by funkathustra I would if I cared about AF performance and access to fast primes. Pentax's AF has always been really weak, and while they've made an incremental improvement (yet again), it's still nowhere near Canon or Nikon's top-of-the-line offerings. Have you ever shot with one of these bodies? Their AF performance is insane compared to the Pentax K-1, K-3, or any other Pentax body I've ever owned.
As for lenses, Pentax has the holy trinity (15-30/2.8, 24-70/2.8, and 70-200/2.8), which is all that a lot of pros need. But where's the Pentax 24/1.4, 35/1.4, 85/1.4, 135/2, 300/2.8, 400/2.8, and 600/4? These are standard offerings from Canon and Nikon, but they're totally nonexistent in the Pentax line-up. The closest thing we have are the three amigos (31, 43, 77), which:
- have slow AF
- aren't weather-sealed
- aren't particularly fast
- aren't particularly sharp wide-open across the frame
That's why you pay $1000 more.
If you shoot landscapes and still-life shots, I don't think you can beat the K-1. But there are a lot of shooting scenarios where other full-frame (or crop-sensor) bodies would make a lot more sense.
You have a lot of valid points regarding faster focus and faster primes. However, coming from 12 years of Canons up to the 5D Mark III and having shot the D810, currently, the only Nikon and Canon bodies that I know which have super fast autofocus or insane speeds as you called them are in the $6K range. All the other Canons I owned, had crappy focus, including the mighty and bargain 5D Mark III!
I tried the Nikon D500 and the D5. Specs say the focus systems are the same. In practice they are two different animals. D500 is lacking big time in speed and the D5, as promised is wicked fast but at a price tag of $6,500.
Granted, my K3 focus is just as bad even worst than any Canon bodies I have owned, the K1 goes a long way to solve that problem. I was always of the opinion that at least in the Canon world, they did not give you decent focus speed unless you spent at least $4k or as much as $8K in their high end bodies. Those kinds of dollars are not in the budget of most people, not even some pros or semi-pros making a living from photography. Remember, pros bring backup bodies. Now you are talking about $6K times two.
If I shot sports, Pentax would not be my choice of a system as the focus and lens selection are lacking. Can one get by if they had a Pentax system and had to shoot sports? Perhaps yes. But if I a made a living from sports photography, I would have to go with Canon or Nikon. However, sports is only one specialized area of photography. there are so many more areas that a Pentax will do just fine or even shine.
Is the K1 the perfect body? Perhaps not. But show me a Canon or Nikon or a Sony that for $1,800 can give you even half of what K1 can give you. So in the value department, and as it has been a Pentax tradition from the beginning, you get a lot more bang for your buck.
As for lenses, Pentax has plenty to serve most photography needs. Yes Pentax does not have f1.4 lenses but my experience says f1.8 will do just fine. The three Amigos are a different beasts on the K1.