Fraser
Well-known
The interesting thing is that for most of the 60s, Pentax was king. And if you ignore the Nikon F's motor or interchangeable viewfinder, the Pentax Spotmatic is a far better designed machine in terms of ergonomics and operation. Pentax lenses of the 60s are not behind Nikkors in image or build quality, in this I disagree with you Ronald. I own the pre-AI 28/3.5, 50/2, 35/3.5 PC, 135/3.5, 58/1.4 and 50/1.4, and i would gladly trade them for their Takumar equivalents, except for the 58/1.4 and 35/3.5 which are special stuff.
The real question of the 60s was "Pentax vs Nikon", Canon was just a niche player famous for rangefinder cameras and RF lenses, who just happened to have a SLR line as well.
Not sure about other places but in the UK Pentax seems to have been very popular as it was an obvious step up from Praktica or maybe Zenit.