The Canon 7 is probably the best body ever made for L39 (Barnack) lenses, outside Leitz, especially because they go for reasonable prices. It is very ease to use, although if you use the light meter, you will need to learn how the two ranges of light metering work. It is not worse than the equivalent Leica M3 meter.
The light meter sensor is selenium, so no batteries, but also risk of a dead sensor and low sensitivity. The shutter curtains are metallic and wrink easily (which does not affect function).
The very nice viewfinder has framelines for commonly used focal distances, with 35mm being the full frame.
This camera can use the famous 0.95 normal lens, which is too expensive for my hobby. It goes on an external mount.
I have been using this RF for about one year now - it has become my favorite platform for L39 lenses.