I just got an NEX 6 delivered with the 16 to 50 mm zoom. I shot a few test images with the new lens and an older - cherry picked 18-55 from an NEX 5n.
Initially, I thought the new lens was much better than the old one. That thought faded as I compared images shot stopped down to f8. The old lens had a significant improvement Stopped vs Wide Open. The new lens was the reverse. Stopped to f8 was slightly to noticeably worse than Wide?? Camera was set to auto focus and there are some frames that are off because of focus error. But every shot at f8 with the new lens is worse than set to wide open, while every shot with the old 18-55 was better closed down. I shot both lenses at 18mm, 35, and 50mm. Jpeg + RAW
I"m too busy right now to figure out how to do 100% crops and post right now. I should not even be messing with them but hey, its a new toy!