I have not seen a truly sharp night IR video with any of the commercial HD cams. Homebrews using the DXG 567 focused for night IR only are the best I've seen anywhere. My 2009 BTC's are about the sharpest I've seen in standard VGA format 640X480.
As you guys know the focal plane (point where the light rays focus) is different between daylight photos and IR light photos, which probably accounts for the fact that night IR's on most cams just aren't sharp. The fixed lens must be factory focused for daylight. Since the lens can't move to focus, at night in IR light, the focus has to be off. In fact I think I read that black light wavelengths have a different focus point than red IR. This probably accounts for the fact that red IR cameras are sharper than black light cameras because the red IR wavelengths have a focal point closer to daylight, than the "invisble" black light cams.

I hope everyone is not thoroughly confused by my explanation!

They explain it better here maybe:
http://www.cctv-information.co.uk/i/Res ... ocus_Shift