Old OM135mmf2.8 lens - any experience/advice on use?

Just found this lens, long forgotten, in the bottom of a locked drawer of long unused photo gear (just discovered the key). It should be a useful (manual focus) lens, given the equivalent reach & fast f-stop, on mft. I will be using it mainly on an OMD.

First photo below was just to check it worked, wide open, as I didn't have a specific good subject to use it for today.

Anyone else have this lens and has experience of use, with tips?

Blue Agapanthus flower head

--
J White Olympus user since OM1