Can I just add that I think what you're seeing may not be better detail, I think its Image sharpening, this , while looks ok from a distance, is very very bad and should be avoided as when the video is upscaled to large screens video that's sharpened looks HORRIBLE in comparison to that which is soft.
A good example of this is the DVD of 28 days later, DV converted to film, converted back to DV, then sharpened and converted to mpeg... looks like someone crapped on your screen but hey, Looks fine on a 21 inch PAL or NTSC set, but the minute you watch it on a HD set you just think "wtf"
It's not about what camera you use or how much it cost.
It's about what you shoot,
how you shot it,
and how you edit it :P