In the right hands, almost any lens—including a fisheye lens—can be used for portraiture. Wide angle, normal, even super-telephoto lenses can be used successfully for portrait work. But if you had to narrow them down to select an optimal focal length for shooting portraits, it would have to be a lens in the range of 85 to 105mm.
Pentax is serious about making top of the line DSLRs. All you have to do to prove it to yourself is pick up the new K-7. The camera body - weatherproofed magnesium-alloy body panels wrapped around a stainless steel chassis - fills the hand with a very solid presence and lacks the polycarbonate feel of many lesser-priced DSLRs. And then you have what can only be described as a serious list of features.
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