Hi - I'm getting really tempted by the CV 17.5mm. As well as its wonderfulness wide open, I'd also want to use it for landscapes. I know it's got some field curvature issues but I'm wondering if that matters once it's stopped down to f5.6 or thereabouts. Does anyone have a full-size landscape image they fancy sharing so that I can pixel peep to my heart's delight? Thanks in advance.