I know that calling the newZeiss 135mm f/2 APO Sonnarthe world's finest lens might be fighting words. But, there is so much photographic goodness wrapped up in this metal and glass device that it may well. At least I can write with absolute conviction that it's the finest lens thatI'veever experienced. 

I no longer do bench testing. A quick Google search though will provide you with quite a few competent optical test reports that attest to this lens' remarkable abilities. Words likeastonishing,the sharpest lens ever tested,totally lacking in distortion and chromatic aberration, are all quotes from these reports. So, if you're a numbers kind of person, search out these reports. They'll give you a warm and fuzzy feeling. If you're looking for a real-world use, hands-on type of report – read on. 

By the way, in my opinion the best reviewer of lenses working today is Lloyd Chambers atDiglloyd. If you want in-depth technical reports on lenses, especially Zeiss, h...