Sports, weddings, portrait, wildlife

i'm a NEX-7 owner and i know that the image quality is better than from the D5100. You can compare it in dxomark.com. But the NEX-7 has a disadvantage too, the autofocus is slower than on a DSLR because it uses a contrast detection method, compared to the phase detection focus on a DSLR its slower and the battery is faster empty than on the DSLR. But except this, in all other sections the NEX-7 is much better and because of this its more expensive. When you have the money to buy a NEX-7 but you want to shoot action look at the Nikon D7000 or the Pentax K-5 (which has the best results and it is weather proofed) and it is cheaper than the D7000 and the NEX-7. I suggest, buy the Pentax K-5 and for the saved money, buy a good lens for it. You cant go wrong with the K-5 its absolutely awesome. sorry for my bad english. good buy!