The reduced noise ratio at ISO values of 400-1600 corresponds to what I would expect from a revision of the SD14. The increased processing speed of the data that invites you, but to make a few more photos in tense moments, this certainly hold.
The revised, faster autofocus, the greatly improved battery life (2 Batteries ~ 1600 photos), the re-arrangement of the controls, the larger buffer, the improved noise ratio, the SD card format (SDHC 4-32 GB, Class 4-10) that greater display with higher resolution and the small fine settings via firmware are improved, positive features than their predecessors.
One thing I must say, however, in principle, with this camera by SIGMA; For less ambitious amateur photographers the SIGMA SD15 is not an easy. You have to with the subject "Photography" set apart specifically and invest in good lenses (eg 2.8 24-70mm f / 2.8 + 70-200mm f /). There is no scene modes, no aid from the system. But return you can operate creatively, without stumbling over annoying features. Operation is simple, although you should know about the mentioned subject matter more.
The SD15 is a digital SLR camera, no point-and-shoot "Digi-clippers"!
My conclusion: The small weaknesses that has any camera system somewhere, give serious and ambitious photographers no need to worry.
