I cut my teeth back in the day with a 135mm Vivitar on various Minolta bodies. Did lots of portraits and concert work. Anybody who says that this focal length (equivalent) is not very useful.... Well, they should try it first.
...and I'm looking forward to that test!
I agree that it ticks a lot of boxes, just not the ones that matter to me - an ACCURATE optical viewfinder and a large enough aperture in the 85 - 105 mm equivalent focal range for soft background portraits.