Here is a back to back comparison chart between the Canon EOS 40D and it’s replcement model the Canon EOS 50D.

	Canon EOS 50D	Canon EOS 40D
Sensor chip	15.1 MP CMOS	10.1 MP CMOS
A/D conversion	14-bit	14-bit
Focal-length multiplier	1.6x	1.6x
Shutter speeds	30-1/8000s	30-1/8000s
Flash Sync	1/250s	1/250s
Continuous shooting rate	6.3fps	6.5fps
Sensitivity range	ISO 100-3200 (plus 6400, 12800)	100-1600 (plus 3200)
Memory Type card	CF	CF
Viewfinder	95% coverage 0.95x magnification changeable focusing screen	95% coverage 0.95x magnification changeable focusing screen
Autofocus	9 point AF (all cross)	9 point AF (all cross)
Live View	Yes	Yes
Movie Mode	No	No
Dust reduction system	Vibrating sensor Dust reference image Anti-static coating	Vibrating sensor Dust reference image Anti-static coating
LCD pixels	920,000	230,000
LCD size	3 “	3″
Shutter durability	100,000 cycles	100,000 cycles
Availability	~ October 2008	Current
Price (street, body only)	USD$ 1,400	~ USD$ 958