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Why would you use the A7 if you wanted sharp? if anything, M43 is much better suited to macro with film lenses, as you're just making use of the sharpest central area of the lens.
Unfortunately, this theory isn't necessarily always true, it's very lens specific. There is a Youtube Channel run by Christopher Frost who specialises in lens testing, currently he has 167K subscibers. He's a Canon shooter and most of his later lens tests are conducted on his Canon 6D and also on both a Canon APSC DSLR and sometimes on his EOS M3. His reviews are very clear and well illustrated, in some reviews, the FF lens in question might not be recommended for APSC sensors whilst performing just fine on a FF camera. M43 will use an even smaller chunk of the FF lens image circle, in some instances that might help or hinder even more in terms of image quality.
https://www.youtube.com/user/christopherfrost
My experience of FF lenses on M4/3 cameras using dumb adapters is limited to some Tamron Adaptall lenses (including the Tamron 90mm F2.5 macro), plus my OM lenses, the results are fine without being breathtaking, the OM lenses in particular need a fair bit of PP tweaking. My recently arrived Metabones Speedbooster is a different story though, using Full Frame EF fit lenses utilises mostly the full image circle for the lens and I've been very impressed with the results so far.