I currently have a 70D and have no need to upgrade because I mostly take photos with it, shoot in RAW and the 20 MPCMOS sensor is enough for me. I have a 17-55 f/2.8 zoom and love the sharpness, f/2.8 speed and IS, but hate the sheer size compared to the small Rebel camera. I needed a small, fast mid-range APS-C prime lens. I tried the 28mm f/1.8 lens but was disappointed. It was too soft, didn't sharpen to f/4. It wasn't worth taking the Prime everywhere with you for how small it is. Canon seems to have two options for digital lines; the Pro "Lβ line with full-frame bodies and high-quality, expensive primes and zooms, and the APS-C format for everyone else. While there are two very good EF-S zoom lenses out there (10-22 f/3.5-4.5 and 17-55 f/2.8), Canon doesn't really release many top-notch EF-S lenses. . It looks like their approach is for EF-S users to use Zoom. Cameras are replaced about every 12-18 months, lenses last about 10-15 years, so it pays to decide on a format and get a body every 2-3 years to keep up with the updates. When I saw Canon launching 35mm f/2.0, 28mm f/2.8 and 24mm f/2.8 lenses with image stabilization, my interest was piqued. I checked out the reviews of this lens and it seemed like the perfect APS-C prime. This lens is a definite step up in quality over the fixed 28mm I've tried before. It's small, sharp and wide open, and IS adds 4 levels of image stabilization. I can easily take clear pictures of still subjects with a shutter speed of 1/3 second. This equates to approximately 38mm in full length. Focusing is (as expected) lightning fast, typical of Canon's ultrasonic motors and reflex systems. The IS mechanism hums quietly during operation. It's sharp from center to corner, vignetting is easily controlled via software in the 70D or DPP, and has negligible CA and distortion (both are also controlled in DPP and in camera). And if I switch to full frame every time, it's compatible even though it's a wide-angle lens. I wanted to sell all my Canon stuff and buy a Micro 4/3 camera and lenses. But the body of the 70D and this Prime changed my mind. It's quite small and about the same size. Given what I've invested in other lenses and the 70D's body, it's pretty easy to stick with Canon. Micro 4/3 is a great little format, but for now I'm sticking with APS-C. If you buy this lens, you can try Canon's E-58 II snap-on lens cap for just $10. Although I would say no to a $50 hood. If you really need a hood, get the VELLO LHC EW-65B and save $40. Seriously, Canon, $50 for a piece of plastic?