I've also had all three in various focal lengths. EL-Nikkors do seem to have more contrast and Componon-S looks a little smoother. I eventually traded my small and medium format enlarging lenses for Apo-Rodagons (50mm and 90mm), which are excellent, though I haven't compared them to Apo-Componons. I use a 135mm Rodagon for 4x5", and it seems to be a pretty decent lens, but I'd be tempted to upgrade to an Apo-Rodagon, preferably 150mm instead of 135mm, if one were to come along at a good price.