I have the APO-Symmar (non L) and have had no issues about lack of sharpness. It is a very nice Gold version of the lens which I bought used 5 years ago. It even got completely soaked in salt water 2 years ago when a wave broke over my head whilst under the dark cloth!
Unless you are using extreme movements, I doubt you will need the larger image circle very much of the time. I don't; unless occasionally doing a 'reverse movements' shot. This is not so effective with the 150 as my 210, so is infrequent.
Mine is in a Compur shutter and given choice, I would prefer a Copal. After the salt water incident, I had been expecting the shutter to pack in - no such 'luck'!