I don't like the 135mm for the 6x7. It's macro ratio is pretty awful. You'll want tubes for that.
The 120mm for 645 is a good lens and goes to 1:1. I've never wanted to get closer than that.
I have a 100mm Macro 1:2 for 35mm, which at first I thought was pretty good, but after using the 120mm it just doens't cut it