Conclusion: The EF 28mm f/1.8 USM is a fast wide-angle optic for use with Canon D-SLRs, but it isn't sharp at its maximum aperture and is prone to color fringing.
Pros: Compact. Fast aperture. Minimal distortion. Sharp when stopped down a bit.
Cons: Not sharp at maximum aperture. Prone to color fringing. No image stabilization. Hood not included.
Summary: Canon EF 28mm f/1.8 USM held a lot of promise on paper - a well performing fast wide angle prime, with silent and accurate AF system in a compact and light format that is
Excerpt: The Canon EF 28mm f/1.8 USM Lens is currently Canon's fastest 28mm lens . And the only wider angle lens that is faster (wider aperture) is the Canon EF 24mm f/1.4 L II...
Conclusion: The Canon EF 28mm f/1.8 USM disappoints on the APS-C format. It is a full format lens yet the border quality leaves something to be desired even when stopped down.
Excerpt: Originally posted 2010-04-12 on Optyczne.pl One of the oldest lenses in the Canon’s current line-up is an EF 28 mm f/1.8 USM model, as it was launched on the market in
Cons: weak image quality at the maximum relative aperture,, low resolution at the frame edge of an APS-C and full frame sensor alike,, quite significant chromatic aberration...
Conclusion: Generally the verdict for the Canon EF 28mm f/1.8 USM cannot be better than for its Sigma counterpart - high center performance but substantially worse borders.