From lenses we own:
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28mm - Bloody fantastic. Uber sharp, nice rendering and very close focus distance. The 24mm is supposedly as good or slightly better, but tough to find used.
35mm - Not owned, but rep is 'meh' (or worse). MTF looks sharp in centre, then....
50mm II - Incredible. Described by some as the Otus of the H line and I'd agree. Tough to find used. The 50 Mod I is reputably not the same beast by a long margin. The macro converter was tailored in design for the 50 II.
80mm - Very nice. i find it far nicer than some make it out to be. Sharp, fast focusing, well worth the very modest $$ requested used.
100mm - Lots love it, I never really took to it. Very, very nice portrait lens due to rendering, etc., but oodles of CA if subject backlit until into mid f-stops. By say 5.6 very, very sharp across field. Has a reputation for some challenges locking exact focus. Ours was fine 80% of the time, but I saw examples of what some complained about. Really have to experience it to see if shoots your shooting style/subjects. Sold ours.
120mm macro II - Incredible, a 120mm version of the 50 II (disclosure have one for sale). Uber sharp starting WO and goes from there. Much faster to focus than I expected from anecdotes, but MUST remember to set focus range on camera or lens will hunt until cows come home. Close setting is good for most shooting.
The focus range option under 'settings' on grip will appear when lens mounted and will be retained on power off/lens swap. No real CA and NICE bokeh. The Mod I version is nice, but Mod II is notably sharper and does't have the CA of the Mod I. The Mod II is tough to find used.
210mm - Reputation only, but considered a very sharp, very nice lens that is a bit of an orphan due to FL and thus very nicely priced used. Not owned, bill be our next acquisition.
300mm - More well known than the 210, but considered very nice. Not owned and not one we'd use.