I actually would like to see a real review between these two cameras. Some sites review the older NEX-5 and not the NEX-5n... and those that do have a comparison between the NEX-5n have the wrong specs...
So I used to have a Nikon DSLR, switched to a canon full frame a few years ago... had to sell all my photo equipment and was thinking of picking up a camera again - something with interchangeable lens'.
A lot of people i work with, have D5100's... mostly due to the cost factor (price drops around Christmas.) But when I look at the Nex-5N I see some pretty amazing stuff.... The video looks way better - and it shoots up to 60p, which is great for slow motion effects. I saw some amazing footage on a website, that honestly appeared better then most professional commercials - all shot on the NEX-5N.
As for lens' - the sony only having 8 lens' isn't really a big deal considering a f mount on the body (at $40) allows you to shoot any Nikon lens .... The only thing you sacrifice on that is the inherent compensation control that comes with the Sony lens'.
So .... regarding the D5100 and video - can you adjust the appeture while in live mode? or does it lock like the canon's used to? I recall the 5d mk ii, couldn't make adjustments in real time in live/video mode.
What I'm looking for is:
A decent camera that either has good lens' or has mounts that work with canon or nikon
A solid video ability (to shoot video through a great lens) - that 60p was pretty sweet to see.
Decent real time effects (such as miniature/tilt-shift effects) that work in video as well as camera mode
Descent price. I still have 2 nikon lens' from the old days... so that's a upside to my considering the D5100...
The wifi on the D5100 is a cool option
I think the big upside for the NEX-5N is the video quality.
NEX-5N has a faster continuous shoot ability 10fps vs the D5100 4fps
But the D5100 (I think) is supposed to focus better with phase detection as opposed to contrast detection.
The upside on the Nikon D5100 (for me at least) is I still have 2 Nikon lens' in storage - but i'm willing to start over.
I would like to know real data comparisons though that might tip this one way or the other... especially if the D5100 can change appeture while in movie mode, etc.