If anyone has the new Sony 20mm 2.8 pancake lens, can you provide the pros/cons of this lens? Because of the size, I want to buy this lens for a upcoming bike trip to take the place of my Sony 10-18mm (somewhat bulky) lens on a Nex-7. From the very scanty information available thus far, I've read really mixed opinions on the lens. When I say, scanty, I also have to include user reviews on B&H, Amazon, and dprreview - since beyond ePhotoZine's (Sony NEX E 20mm f/2.8 Pancake Lens Review) endorsement, there just isn't much out on this lens thus far. Some user reviews say the lens just isn't sharp (akin to the 16mm), and that would be a deal-breaker for me. Thanks in advance.