An ex-Pentaxian here too.
I used to run a quintet of MX bodies with an assortment of lenses amongst others.
The stable of bodies was the consequence of a liking for the different results from various film stock and haveing an acquaintance who ran a 'Hock Shop' and was able to acquire good used gear at reasonable prices.
Mamiya C330s, an RB67 and a Hasselblad ELM fed my medium format needs at different times.
I did bag some Leica 35mm gear at one stage, which I made a modest profit from the resale of.
There was a brief period where I had an interest in a colour processing lab but my health was deteriorating badly at that juncture so I had to walk away from that.
There was no question regarding the superiority of the 1970s Pentax lenses in 35 mm equipment - the pathetically particular and pendantic photo club folk frequently lost the arguments over that when both Canon and Nikkor lenses failed to exceed their results.
The Mamiyas were more than equal to the 'Blad in producing images of quality.
I once had a problem with the dollybirds who ran the "Art" department at a well known fashion magazine who repeatedly rejected work which I submitted due "...to it being made on inferior quality equipment...", but never that which came off the ELM.
Then I twigged their game - they were using the defining notch on the edge of the images from the 'Blad to determine their choices.
So I carefully made a mask for the C330s which imitated that 'notch' on the transparencies and had no more problems!
The bellows and internal material bags in the Mamiyas were better at eliminating lens-flare and fogging, especially in less controllable lighting situations, than the barrel lenses of the Hasselblad.
' T was a grand time, barely profitable - and most often not, especially when the value of time was taken into consideration.