Originally posted by Prince Harbinger Sony doesn't make a 600mm that has a aperture of f/2.8 They make a 600mm F/4 prime that is 13,000.00 While I could save a little and buy that lens. I'm not interested in spending that much money on a lens. I've been using the A6300. I'm done with APS-C cameras. I'm ready to move on to a better more supported format. I'd go over what I'm tired of with APS-C cameras. However I feel it would be like debating which religion is right. You're content with your format and I'm not content with it anymore. There's no convincing me to stick with a format that I've lost interest in. I don't like it for landscape and portraiture. Let alone for tight event spaces. I don't like not being able to see my vintage glass the way it was intended to be seen. You could say than use a focal reducer but that degrades the photo quality. It also changes the character of the bokeh. Giving it a unnatural swirl that I don't want to see on a lens that isn't suppose to have swirl to begin with.
My solution is FF (K-1) for landscape and larger wildlife, APS-c for birding and smaller wildlife. (K-3)
I'm content with my formats, I've figured out what they re good for for my own use, and my suspicion is you're not going to get what you think you're getting. But the frame rate with Sony is such that you may be happy with a one format solution. My main objection is the weight of FF long glass and the expense. You don't want to spend the money on a 600 ƒ4 for FF, but I have a 300 2.8 that with a 1.4 TC is 420 mm APS_c or 630 FF mm at ƒ4. So, I'm assuming you have no experience on using FF glass, or understanding why my FF body gets left home when I'm birding. You have to carry those beasts to understand. If you never plan to use long glass, FF is a viable one format solution. But Aps-c is more useful in many situations. That's why I shoot both.
But long story short, if you aren't buying $7k-$20k glass for your FF, you won't be getting what I get from my $2k APS-c glass.
Sometimes my camera bag has both my K-1 and K-3 in it with appropriate lenses attached. The DFA 28-105 on The K-1 for landscape. The DA 55-300 PLM on the K-3 for wildlife and birding.(8 FPS isn't too shabby.). And the tiny Sigma 24mm FF lens in the bag , just in case. It doesn't even take a large heavy bag to carry them, and the three lenses can all be used on both formats so 3 lenses but 6 distinct fields of view.
So seriously, I can't entertain your anti-APS-c opinions. Every camera I own (of the 6, with 4 different formats) has a use for which it is the best option. These are tools, popularity contests are futile. They each do what they do.