TBH I find something around the 100mm or 120mm mark more useful. Not least because the minimum shutter speed for using them handheld is lower. 1/125 is fine with these lenses but would probably cause shake with a 135mm.

What's puzzling is how 135mm remained the "standard" telephoto prime. I don't know about other brands but Pentax tried offering 100mm, 105mm, 120mm, and even 150mm around that length (as well as the usual 200mm and longer). People evidently carried on buying 135mm regardless, judging by the way I can lay hands on a used 135mm any day but the others are often pretty rare.