Just want to say thank you to everyone. I'm jumping ship to Pentax.

I was in the same boat at the beginning of the year. Moving from m43 & APS-C systems to FF. My APS-C was Pentax, the bodies are great but the lenses a bit iffy, a lot of CA, soft corners and especially the AF - very hit and miss.

The K-1 was top of the list except for one big issue, lenses.

The limited's are ok, but their old slow noisy AF wasn't tempting. If Pentax had just repackaged the limiteds with modern fast & quiet AF motors, with weather sealing, that would have been enough for me.

As it is, the only lens that had enough scope and quality is the cheaper zoom, actually designed and made by Pentax, the 28-105mm. It's actually a good lens. The rebranded Tamron's just don't cut the mustard for their weight and price, I couldn't recommend them to anyone.

I've been watching if any new actual Pentax-made lenses might emerge, but no. And still no support from Sigma. Unfortunate.

Then I saw the output of the Fuji GFX, and importantly the performance of the GF lenses. Those lenses are possibly the best on the planet, certainly beating most Zeiss primes. Even the GF zoom is better than most primes - which as it turned out was my perfect wish-list zoom range, wide to standard.

I bit the bullet, and went for the adventure of an amazing new system, the GFX. I've never owned such a great camera in all my 30+ years of photography (which has included Hasselblad and Sinar).

I think the K-1 is a great value quality-sensor FF camera, if rather heavy. The lenses are very lacking, and the K-1's AF isn't great. It's such a shame Sigma couldn't have just made their newer crop of lenses in a K mount - I'm sure there would have been a lot of takers! And also me for the K-1, but no, the reality is lack of quality lenses - I couldn't look past that.