I too have only a fat TE for the M mount, and like Nikon Bob said, mine has been entirely satisfactory. I bought it new at a camera store in downtown Seattle 40 years plus two months ago, $196 retail. About 2 weeks take-home pay at the time, as a new Boeing employee. I admit I haven't used it much, as the focal length is long for my purposes. So I seldom carry it around; I did take it on a European trip 7 years ago and only used it once.
I admit to a 90mm Sonnar-G also, which is at least as good optically, and easier to use because of the Contax G camera's zooming viewfinder. But the Sonnar too mostly sits on the shelf.