From good NEF file, reaching 12x16 is very easy. (with a little help from PS7 bicubic interpolation) Sometimes I have to have 20x24 and still got good result. That's all print using Durst Lambda. Of course with just enough amount of inteligence sharpening.
But I still want full frame sensor.
Pinky Mirror Nikonians@Jakarta,Indonesia-- it's near Bali, if you don't know where it is