Wishin' ya good luck.
I quit comparing lenses years ago unless I had good reason to consider a significant upgrade. And then only if I could directly compare images i hand. A lens is either satisfactory or not -- excluding operator error!
I get as good PRACTICAL results from 30+ year old Adaptall-2's as I do from current Tamron lenses*,with due regard to modern coatings which I've learned to accommodate. (A recent spinal trauma has caused me to 'advance' to to AF lenses, not because they produce better focus but because technology has made it possible and necessary for me.)
Truth be told, my day-to-day attention to detail has affected my image results (film or digital) more than any $$ expenditure I've ever made chasing better images -- an' I've put up with suppressing LBA for half a century for economic reasons.