I also have the 135/2 APO and agree it is an extraordinary lens! I find it can exceed the sensor capacity of the best full-frame cameras. It's not an easy or forgiving lens to use (weight being one of the constrains) but when you get it focused properly on a stable tripod there are few optics that can approach is resolution, contrast of "look". BTW I really like your image!

During my sixty years of photography & cinematography I've never experienced anything like this lens - except maybe the Otus 55, which I tried for a few minutes and rejected for its weight and size. This lens is even bigger and heavier, but I'll just have to start doing pushups.