I needed an all-purpose lens. I wanted nice range, small, light and cheap on a 300D for light travel trips
Iíve done some tests VERSUS the Canon 18-55mm (nothing scientific-and one copy of each) indoor and outdoor like on wall and landscape.
a)@18mm Iíve found my 18-125mm is less sharp than the 18-55mm at all f-stop, center to corner.
b)@ 24 and 55mm Iíve found the 18-125mm is sharper than the 18-55mm (18-125mm f5.6 nearly as sharp as 18-55mm at f8).
c)The 18-125mm focus is slow and very very noisy compare to the 18-55mm
d)@ 105mm the 18-125mm is soft and @125mm it is worst.
e)The color is warmer than the 18-55mm but the contrast is good.
Overall : This lens, at least my copy, is nicer than expected. If you get in mind the 6.95 ratio versus the 3.05 ratio of the 18-55mm, the 18-125mm sigma is a well better lens. If you want 8x10 or higher prints, you have to be in the 24-85mm range which this lense is a very very good performer.