It's been over two years since Nikon's popular enthusiast-oriented D7000 came out, and they've finally released an upgrade in the form of the D7100. Improvements include a new sensor, and updates to the AF system, while CNET says the design "has the same look and feel as the D7000, with a nice grip and solid build quality." TrustedReviews agrees, saying the D7100 "feels solid, with a blend of magnesium alloy and polycarbonate creating a hardy yet lightweight shell." And how about that improved autofocus system? TechRadar found it "fast and accurate," and Digital Photography Review calls it a "fast, responsive camera in most operational aspects." While Digital Camera Review also found the autofocus performance fast, they point that the D7100 "can be a bit sluggish in low light situations." One area the new autofocus didn't help is the D7100's video mode, as Photography Blog says the "contrast AF system is still too slow to keep up with fast-moving subjects." The new sensor in the D7100 results in impressive photo quality, with Digital Photography Review saying it "delivers outstanding image quality and detail rendition at low ISOs in both JPEG and Raw mode." Camera Labs says the D7100 "produces excellent quality," calling the results "an improvement on those of its predecessor." Despite the improvements, Pocket-Lint felt it didn't offer much over the cheaper D5200 saying the "results are otherwise much the same," and CNET agreed, stating "nothing about the D7100's photos noticeably outclasses those of the D5200; they're similarly good." As for the new sensor's impact on video quality, The Phoblographer calls the video quality "standard for a DSLR." Even with an improved AF system and better image quality than its predecessor, is the D7100 worth the upgrade if you already own the D7000? CNET doesn't think so, saying the D7100 "doesn't feel like a must-have upgrade," and with image quality on par with the cheaper D5200 it may even be a hard purchase for newcomers to the DSLR market.