It all depends on the capsule
There's a lot of crap (cheap Japanese high impedance dynamics from 60's-80's for example - never found any usable) but there's alot of good microphones.
Some really bad sounding can be well used as effect microphones, especially for vocals. Pretty good for overdub of vocal mixed to the main clean vox.
German/Austrian microphones - Uher M534 which from what i remember is 750ohm, works pretty good on many sources with standard 2k input preamp. It has some coloration due to higher impednace. It's the same type of capsule which you can find in many other AKG mikes like D119 etc. but the rest is usual 200ohm.
There was a lot of high impedance microphones which had step up transformer. D9 akg have really great large diaphragm capsule (same type as D14) but there was a lot of different impedance versions like 15ohm, 60ohm, 150ohm, 200ohm etc. All were used with additional transformer for ...kohm output. The other models sold as AKG/Telefunken/Uher had similar capsules but some had direct 500ohm from the capsule for example.
Similar with some grundig mikes (usual sennheiser made).
MD417 from sennheiser use 800ohm version of the capsule which you can find in MD419 and MD441. It's also very usable microphone even if it's high impedance.
My favourite snare microphone is Revox M3500 which is ca. 600ohm version of Beyer M201.
Definately worth to test some.