A Pentax K20D tem menos latitude, então pra mim não serve.
a700 vs k20D
http://forums.dpreview.com/forums/read.asp?forum=1036&message=27749593"It's very difficult without directly comparable lenses. I do have the K20D here, alongside
the Alpha 700, and I do have 50mm macro lenses for both though the Alpha one is 20 years older.
I would find it very difficult to choose. I am not all that keen on the A700 high ISO, even with
Firmware v3; it's more prone to unwanted hot coloured pixels, and the default minimum NR is too
strong. The K20D high ISO NR is more like the Nikon D300, so despite the higher pixel density, I'd
rate it better than the A700 for overall image quality in noise/ISO terms across the full range.
Having said that, a good A700 image taken to Alamy size (5120 pixel export) can often look sharper
than a similar K20D image. There's an elusive softness to the sharpness on the K20D (same goes for
the Alpha 350 as well). It may be just that the lenses are finding life a bit harder. Also, the K20D
dynamic range and balance of colour, contrast, shadow detail and highlight recoverability all fall
short of the Alpha 700 (but the same goes for the D300 too).
On balance, I would be unable to make a decision except on price and whatever gear I already had. I
certainly would not advise a Pentax system owner to switch to Sony, or an Alpha system owner to move
to Pentax - in both cases, buying the K20D or the A700 would be a better solution 'staying in system'.
Both will produce perfect A2 inkjets or double page spread litho reproductions."
