Panasonic works with Leica and Samsung works with Schneider Kreuznach. Don't know whether these connections improve their respective lens design and quality control, but both are developing good lenses for their mirrorless cameras. Sony has a relationship with Zeiss, but thus far only one E-mount zeiss lens that is both larger and more expensive than expected, with performance not expected to be much better than the compact and cheaper integrated lens in the Fuji X100. Of the current E-mount lenses, the 16mm, while small, is not great; and the 30mm macro and the 55-210 zoom lens are both disappointingly larger and slower than expected. Can Sony match the competitors in lens design and manufacturing? Did the lens design capability from old Minolta not pan out? The NEX series cameras are great thus far, so there is still time for Sony to catch up in lenses; but thus far it's slow and disappointing. In the longer term, can Sony deliver lenses that delight its customers in terms of size/price/performance, like Samsung's 30/f2 and 16/f2.4, Panasonic's 20/f1.7 and X 14-42 pancake zoom, and Olympus's 12/f2?