Thanks, i downloaded PTLens -- price, and the plug-in works with my work-flow
so far have only used it for lens distortion and perspective almost entirely with the 24-105. perspective sliders aren't quite intuitive, and are "sticky", but i'll blame the later on my old, slow computer
side-by-side screen comparison looks good, but i haven't made any large comparison prints yet
the older comparisons between PTLens and DXO were favorable to PTLens, and the latest reviews for DXO are somewhat mixed, 16-9 in particular
other than the time involved, is there any reason for not processing images for distortion? i'm surprised at the amount of correction at mid and longer focal lengths