Writing this at 11,600' elevation high in the mountains, with a cell signal.
The Zeiss 135mm f/2 APO-Sonnar is spectacular out in the field: my Nikon D800E has never been treated so well (resolving power). Want to shoot at f/2 to enjoy the vignetting help for high contrast lighting yet have full resolution? So long as depth of field works, it’s a stunner.
These images shot in harsh mid-day high altitude daylight. The white rocks act to provide a natural fill light, so shooting these backlit trees works well, or at least provides opportunities; the lighting is very difficult to work with otherwise especially with the sun high overhead as the summer solstice approaches.
I’ll have examples and field usage guidance in Guide to Zeiss upon my return.