No 24fps or 50+ fps (for slow motion like
) video
video AGC?
No AF in video
Video binning instead of downsampling (no DSLR does this at the moment)
RAW buffer size
No 2nd SD card slot
Tethering
Size & Number of AF points
AF point sensitivity(f2.8) (this combined with a smaller AF point is equivalent to canon's "spot af" mode)
No usage of color information for intelligently selecting AF point when an object is moving
No proximity sensors by the eyecup for enabling SR and turning off the rear LCD
1/180s sync speed
P-TTL reliability (untested)?
non-grip AA battery compatibility

(These are not actual complaints, but ideas for improvements for the future)