Hee, actually, Pentax was considered a pretty solid brand. Exacta was actually pretty big, once, I understand, though maybe not distinguished by anything we'd fawn over now.
If I'd been born some twenty years earlier, I often wonder if I'd have gone with Topcon or maybe Nikon F's. Or what.
(I tend to think I wouldn't have gone with the Canon R- and FL's back then, for lack of TTL metering possibilities, and when the FT came out, I'm pretty sure the QL system would have scared me off if I hadn't (in my real life) inherited it and learned first hand that you can trust the incomprehensible thing quite implicitly.
Or, maybe I'd be all about rangefinders and very skeptical about this new SLR thing.
That sounds pretty plausible.