Compared to...

Studio comparison between Canon PowerShot S1 IS and Konica Minolta DiMAGE Z10 at ISO 400

Studio scene comparison (@ ISO 400)

• Canon PowerShot S1 IS: Aperture Priority mode, ISO 400, Default Image Parameters,
  Manual white balance, +0.3 EV compensation
   
• KM DiMAGE Z10 : Aperture Priority mode, ISO 400, Default Image Parameters,
  Manual white balance, +0.3 EV compensation
   
• Lighting: Two 800W studio lamps with dichroic daylight filters bounced off the ceiling

Canon PowerShot S1 IS	Konica Minolta Z10
ISO 400, 1/25 sec, F4.5	ISO 400, 1/15 sec, F4.8
1,340 KB JPEG	1,302 KB JPEG

At ISO400 the differences are still slight, with both cameras exhibiting a fair amount of noise, particularly in the blue channel. Of the two the Canon's noise is more visible, though again you can see that edge sharpness is a little better on the S1 IS.