Looking for some advice for expanding my glass

[ac12]

Good on your decision to go medium format.

If you ever think back to 35mm or dSLR, remember "jack of all trades, master of none."
Example, an 80-200 is in theory a nice portrait lens. BUT it is NOT a light lens. My arm would HURT after shooting with it all day. I would rather select a smaller and lighter zoom, or primes that match the shooting requirement.
OK, so I don't work out at the gym every day.

 

[OldManJim]

I have some old MF and enlarger lenses from the 1930s that perform as well as the more modern lenses. I think in the old days, lens quality was tested by actually evaluating photos, not test charts. Probably the percentage of "good" lenses was lower than today but those that made it through the testing process to acceptance, were pretty darn good. Think about it, before there were algorithms, someone had to actually make a good lens. The algorithms were created using measurements from those "good" lenses. So, is a copy better than the original? Not in most things.