FWIW, I've owned an early 8-element Super-Takumar 50/1.4 that was sharper wide-open than any other old 50/1.4 I've tested yet, including a Nikkor, Olympus Zuiko (>1.100.000 serial number), Konica Hexanon and even a Carl Zeiss Planar T*.
Also owned two 7-element Super-Multi-Coated Takumars, which were not as good (in sharpness) as the older 8-element version but still better than the Nikkor, comparable to the Zuiko.
Worst 50/1.4 by a mile was a pre-AIS Nikkor by the way. "vintage charm" is the nicest way to call it.
Either you've had extremely bad luck with your copy, or you're talking bullshit/hyperbole.
Takumars on the whole are pretty ok in IQ in my experience, I remember their tiny 35/3.5 being really sharp. Not the prettiest bokeh overall though IMO, rather neutral in character.
Build quality wise they're second to almost none though. I honestly can't say my Rigid and Dual-Range Summicrons feel any better in operation than a Tak in good condition. Their focusing rings especially are ridiculously good.