A couple of years ago I was able to pick up a very nice Omega D5-XL locally and so I decided to sell my other two enlargers on eBay. Since I had three 50mm lenses (Omegaron, Componon-S, and Apo-Rodagon), I tried to test them against each other to decide which one to keep. I printed an 8x10 (B&W) of a scene with a lot of corner detail, with each lens set at around f/11 or so. The Componon-S and Apo-Rodagon were virtually indistinguishable (I actually thought the Componon might have a slight edge, but kept the Rodagon anyway); the bigger surprise was how close the $60 Omegaron came to the others.
Now the test is kind of moot, because the D5-XL included the three lens turret with a set of El-Nikkors (63,80, and 135). Mostly I just use the 63 for 35mm and rarely bother mounting up the Apo-Rodagon, since I can't tell the difference. The 63 gives a little more clearance between the head and the easel when I'm printing small, which is nice.