Here are some primarily sensor-related specs for comparison.
Model
FOVCF
Sensor
Pixel
Size
Canon PowerShot G1 X
1.9x
18.7 x 14.0mm
4.3µm
4352 x 2904
14.3
f/6.9
Canon PowerShot G12
4.7x
7.4 x 5.6mm
2.7µm
3648 x 2048
10.0
f/4.3
Canon PowerShot G9
4.7x
7.6 x 5.7mm
2.5µm
4000 x 3000
12.1
f/4.0
Canon EOS Rebel T3i / 600D
1.6x
22.3 x 14.9mm
4.3µm
5184 x 3456
18.0 .85x
95%
f/6.8
Canon EOS Rebel T2i / 550D
1.6x
22.3 x 14.9mm
4.3µm
5184 x 3456
18.0 .87x
95%
f/6.8
Canon EOS Rebel T1i / 500D
1.6x
22.3 x 14.9mm
4.7µm
4752 x 3168
15.1 .87x
95%
f/7.5
Canon EOS Rebel T3 / 1100D
1.6x
22.2 x 14.7mm
5.2µm
4272 x 2848
12.0 .85x
95%
f/8.3
Canon EOS Rebel XSi / 450D
1.6x
22.2 x 14.8mm
5.2µm
4272 x 2848
12.2 .87x
95%
f/8.3
Canon EOS Rebel XS / 1000D
1.6x
22.2 x 14.8mm
5.7µm
3888 x 2592
10.1 .81x
95%
f/9.1
Canon EOS Rebel XTi / 400D
1.6x
22.2 x 14.8mm
5.7µm
3888 x 2592
10.1 .80x
95%
f/9.1
Canon EOS Rebel XT / 350D
1.6x
22.2 x 14.8mm
6.4µm
3456 x 2304
8.0 .80x
95%
f/10.2
Canon EOS 300D Digital Rebel
1.6x
22.7 x 15.1mm
7.4µm
3088 x 2056
6.3 .80x
95%
f/11.8
Canon EOS 60D
1.6x
22.3 x 14.9mm
4.3µm
5184 x 3456
18.0 .95x
96%
f/6.9
Canon EOS 50D
1.6x
22.3 x 14.9mm
4.7µm
4752 x 3168
15.1 .95x
95%
f/7.5
Canon EOS 40D
1.6x
22.2 x 14.8mm
5.7µm
3888 x 2592
10.1 .95x
95%
f/9.1
Canon EOS 30D
1.6x
22.5 x 15.0mm
6.4µm
3504 x 2336
8.2 .90x
95%
f/10.2
Canon EOS 20D
1.6x
22.5 x 15.0mm
6.4µm
3504 x 2336
8.2 .90x
95%
f/10.2
Canon EOS 10D
1.6x
22.7 x 15.1mm
7.4µm
3088 x 2056
6.3 .88x
95%
f/11.8
Canon EOS 7D
1.6x
22.3 x 14.9mm
4.3µm
5184 x 3456
18.0 1.0x
100%
f/6.9
Canon EOS 5D Mark II
1.0x
36.0 x 24.0mm
6.4µm
5616 x 3744
21.1 .71x
98%
f/10.2
Canon EOS 5D
1.0x
35.8 x 23.9mm
8.2µm
4368 x 2912
12.8 .71x
96%
f/13.2
Canon EOS 1D X
1.0x
36.0 x 24.0mm
6.9µm
5184 x 3456
18.1 .76x
100%
f/11.0
Canon EOS 1D Mark IV
1.3x
27.9 x 18.6mm
5.7µm
4896 x 3264
16.1 .76x
100%
f/9.1
Canon EOS 1D Mark III
1.3x
28.1 x 18.7mm
7.2µm
3888 x 2592
10.1 .76x
100%
f/11.5
Canon EOS 1D Mark II N
1.3x
28.7 x 19.1mm
8.2µm
3520 x 2336
8.2 .72x
100%
f/13.2
Canon EOS 1D Mark II
1.3x
28.7 x 19.1mm
8.2µm
3520 x 2336
8.2 .72x
100%
f/13.2
Canon EOS 1DS Mark III
1.0x
36.0 x 24.0mm
6.4µm
5632 x 3750
21.1 .76x
100%
f/10.2
Canon EOS 1DS Mark II
1.0x
36.0 x 24.0mm
7.2µm
4992 x 3328
16.6 .70x
100%
f/11.5
Pixels/Megapixels
Viewfinder
DLA*
* DLA (Diffraction Limited Aperture) is the result of a mathematical formula that approximates the aperture where diffraction
begins to visibly affect image sharpness at the pixel level. Diffraction at the DLA is only barely visible when viewed at full-size
(100%, 1 pixel = 1 pixel) on a display or output to a very large print. As sensor pixel density increases, the narrowest aperture
we can use to get perfectly pixel sharp images gets wider.
DLA does not mean that narrower apertures should not be used - it is simply the point where image sharpness begins to be
compromised for increased DOF and longer exposures. And, higher resolution sensors generally continue to deliver more detail
well beyond the DLA than lower resolution sensors - until the "Diffraction Cutoff Frequency" is reached (a much narrower
aperture). The progression from sharp the soft is not an abrupt one - and the change from immediately prior models to new
models is usually not dramatic.