Well, it depends on what you're looking for. The Sigma DP cameras have fixed lenses, the wider one being a 28mm equivalent. Will this be sufficient for you?
The Foveon sensor delivers very natural looking colour and generally very good quality at low ISOs, but it certainly doesn't rival the D800 in terms of resolution, dynamic range or high ISO/noise (if you care about this).
As with any camera: to get the best out of the files, you'll need to shoot raw, but in case of the Sigma RAW support in 3rd party software is rather limited. You might have to get along with Sigma's own software.
-- Markus
The Foveon sensor delivers very natural looking colour and generally very good quality at low ISOs, but it certainly doesn't rival the D800 in terms of resolution, dynamic range or high ISO/noise (if you care about this).
As with any camera: to get the best out of the files, you'll need to shoot raw, but in case of the Sigma RAW support in 3rd party software is rather limited. You might have to get along with Sigma's own software.
-- Markus
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