Another test with a few interesting midrange zooms and on prime (as a reference):
Canon FD 2.8/35-70mm SSC
Nikkor AiS 3.5/35-70mm
Nikon AF 3.5-5.6/28-80mm D
Tamron SP 2.8/35-80mm
Minolta MD-III 2.8/35mm
And now the entire Minolta MD-III midrange zoom line-up ;)