I have 13 P67 lenses. They all perform splendidly on my 645Z digital.
Some were rather "ordinary" on film with a 67 II (like the 45 mm f/4 or the 90 mm f/2.8) but fare better on a smaller 33 X 44 mm sensor. Out of my 13 optics, my 3 best are in order 1) late 55 mm f/4 2) late 75 mm f/2.8 and 3) late 105 mm f/2.4 ("late" doesn't mean they are dead, it means they were the latest issues before Pentax film 67's went out of style).
The 105 mm is a "normal" on a film 67 (lens factor being 2.1 X), equivalent to a 50 mm on FF. On the 645Z, it acts as an 85 mm short telephoto. It is a "powerful" lens, with high resolving power, super deep contrast and totally impervious to flare or ghosting. Only drawback is the minimum focusing distance is rather longish at 1 meter.
The lens is all-metal, built to last a lifetime, substantial without being heavy. Older copies sell for 400 $ on eBay, newer copies (with rubber focusing ring) may fetch 800 $ or more but the lens is really worth its money. Some use it wide-open to totally blur the background like in portrait photography. Personally I use it @ f/8 in landscape imagery to make sure the picture is absolutely sharp from corner to corner.
A wise investment overall.
P.S. Sometimes, bold characters are employed only to make the text more legible.