i had an h4 but never liked it, too much like a toy. so when i was asked by a close drummer friend to shoot his mom's 85th birthday party (he performed with three different ensembles), i got the h6. wow. i'm pretty jaded, but this thing blew me away. i had the mid-side mic and a rode shotgun, also gave me a -12db safety track. sounds great.
my point is, zoom has grown, the stuff they make now is really good and reasonably priced.
Comparing the Zoom q4 and Sony hdr-mv1 online doesn't give a clear impression; however I think the q4 looks quite cool.
The mics look better protected on the Sony. ;?)
Mat (Techmoan) did a 30-minute video review of the Sony HDR-MV1 and was generally impressed but he did say that the 1080p is a bit soft. Here is a link to the review where you can also download some raw video directly from the camera.