There can be problems here. few years ago in the 1980's Hoya released a series of lenses Multi-coated some fixed FL others zooms, Under test they had excellent resolution so you'd assume good information for buyer,
Originally Posted by Gerald C Koch
No so, resolution is only part of the issue, more practical tests are also needed to get a balanced overview. The Hoya range was extremely prone to flare the Multi-coating wasn't to every air/glass surface. Hoya quietly ceased making the range and went back to the drawing board, they released a completely new range of lenses under their Tokina brand name.
My experience which I guess most here would agree with is that the standard lenses from all the larger manufacturers are all capable of producing high quality results and I found no noticeable differences between early 55mm Takumars and later Multi-coated 50/55mm Pentax lenses, nuances at wider apertures.
So when selecting a lens a balanced approach that combines resolution testing an practical field testing is the most reliable. Bruce's practical approach is a valid opinion because he's using high quality lenses from 2 manufacturers who have an excellent reputation for their lens quality.