Какой фотоаппарат лучше Canon s5is или Canon sx1 is?

SX1 IS лучше.
https://www.dpreview.com/reviews/canonsx1is
Higher resolution sensor (10MP vs 8MP)
New 28 - 560 mm equiv lens
Digic 4 processor (S5 IS was Digic III)
Larger, higher resolution LCD screen (2.8 inches vs 2.5 inches)
HD movie recording at 1080p (1920 x 1080)
'My Menu' system
Greatly increased continuous shooting (burst) speed
RAW file format is back