Summary: Use to run the digital imaging dept for a major ad agency, now retired. I was looking for a digital camera to replace my old Fuji digital outfit and I was always like the Sigma brand of lenses ( We had a couple of them at work.) so I looked into the Sigma and was amazed at the quality of the samples I downloaded. I then purchase a SD 14 outfit.
Summary: The Sigma SD14 is hands down one of the best dSLRs on the market! But, it is not for the beginner or novice shooter! It has no auto modes or fancy shooting modes, just the bare basics a Professional needs! Resolution is on par with a Canon 5D full frame sensor camera. Color reproduction is unmatched thanks to the FoveonX3 sensor technology capturing all RGB colors instead of interpolating(guessing) at 2 of the three colors per photosite.
Summary: Sigma SD14's were expensive when they first came out, but I just couldn't resist when price dropped below $300, too bad price has gone back up again lately. For a digital camera of this calibre, and like most other high end digital cameras, shooting RAW and processing it properly will give you the best results, however its JPG files are really quite excellent as well as long as you know how to adjust WB, exposure, and other parameters correctly to your liking according...
Summary: I purchased this camera to use as backup but I was impressed enough that I puchased a second to use as my main and a backup, The camera does have some short comings, it is slower than I would like and you do have to allow for that but the picture quality is second to none.
Summary: Impressive does not begin to contend for the image quality and color that this camera can produce. I know people who have digital slr ranging from nikon d40 and canon xt to the nikon d3 series and canon 1d series and have loved the quality some of these cameras can create. But when it comes to landscape and studio photography (mainly what I do) this can contend with anything from canon or nikon.
Summary: I own a Canon 5D and Nikon D3 and my Sigma SD14's image quality is on par with both of these cameras.
... it does have a few shortfalls. Such as:
1. In low light conditions,... shadows will have "blotchy" noise and speckles of magenta compared to the same shot taken with a 5D/D3 at the same ISO settings. This can even happen in daylight conditions where there is a very wide dynamic range.
Summary: I sold my Canon 40D and lenses (Including L glass) to fund my purchase of the Sigma SD14. I miss the low light ability and the all around speed of the 40D. I miss the superior battery life and the ability to shoot full frame (If I bought another camera body) with the same lenses that I invested in for the Canon. I miss the stable operation (No lock-ups) of the 40D.