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AF Fine Tune?Errrm... yeah ok. (For AF lenses, I only have brand stuff, and so far, I've had to AF-finetune 100% of those, both Canon and Nikon.)
You don't need it; don't buy a new camera because you think it will get you sharper pictures.
I never use the AF Fine Tune feature on any of my cameras — it's not needed. The only time I need AF Fine Tune is with the occasional off-brand lens, or the very odd sample of older AF lens from the 1980s.
So long as you stick to real (Nikon, Canon or LEICA) lenses and are buying reasonably new products from the past 10 years or so, DSLRs have all the proper corrections already in their firmware.
AF Fine tune is only needed for one in twenty BAD old lenses. All modern lenses need no tuning, it's only for old ones from the 1980s you already have in your collection if you're an old-timer like me — or maybe if you have some junk from Sigma or Tamron or whoever you're still trying to use with your new camera.
If you're buying new lenses for your new cameras, AF Fine Tune will only make your photos worse by screwing with it.
So, as always, stick to name-brand lenses, and don't go telling anyone I told you you needed a new camera to get sharper pictures.