Like I said, you just need "enough" sharpening. If you are creating artifacts then you're doing it wrong. And 100% sharpness isn't crucially important to many people anyhow... just mostly the gearheads, pixelpeepers, and measurebators.
Maybe it's because I retouch my images on a 30" screen, but I am often viewing fairly large portions of my images at 100%, and I simply don't like looking at inferior image quality. I have piece of mind knowing that if my images look acceptable at 100%, then they will look great at lower resolutions/prints.
Open your mind and accept the fact that FF isn't the end all be all. There ARE other ways to achieve excellent results.
90% of my portfolio was shot on a crop, so that much is pretty obvious, no where have I said using a crop won't get you excellent results, but what is the title of this thread?
So while you can get excellent results on a crop, you can get better with FF (well at least I can from my personal perspective)
I only said ALMOST because surely your dog would have moved a bit between shots, and different lenses have different distortion and flare characteristics. But the DOF, subject distance, focus distance, and perspective would be the same. I could duplicate your shot with this. And who knows, it might have even handled the flare better than your lens and improved the shot.
No at the same framing it wouldn't, maybe it would if you filled the frame with his head.
And regarding the flare, bth I thought the flare was lovely in that shot, maybe your a person who doesn't like flare?

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