I started with a fine K/L 180mm, and bought a K/L 90mm, then got great deals on a K/L 250mm, and a C 50mm.
The 50 is a superb wide angle, the 90 a fine (mathematically correct) normal & current go-to. The 250 seems better for portraits than the 180 for which I maintain great respect. All these have the floating element ring, so even the maligned 50 is a sharp performer if used correctly.
Problem is, I am from the Olde School where one was taught the very best way to “master” photography was to own one camera, one lens, use one film, one developer and so on. This made the shutterbug become intimate and therefore instinctive when using these tools; to mold a distinctive style based on the chosen format & lens.
As a result, on occasion I consider chucking the extra glass, glomming onto a 127mm and going back to my roots. In my formative 135 years, my weapon of choice was a Nikon FM fitted with an AIS f/2.5 105mm Nikkor, and indeed, I got pretty good with it. The 250mm has a similar angle of view, but then there looms the superb L 210mm APO...
GAS is a terrible thing, isn’t it?