I'm old enough to remember them both, including the fact that the 135 was actually f/2.3 - the odd maximum aperture specification was one of the marketing tricks they used to set these lenses apart. Ditto for the 28/1.9 and 200/3 in the original S1 line (although now after all these years there's a 28/1.9 once again in the C/V line of Leica screw-mount lenses).

Alas, I've never owned one, nor do I know of a review online - all of these lenses were long gone before the web really began to pick up steam. Best bet, albeit much more work, would probably be to track down a library that has old photo magazines.