Tom,
I dont know. I do know that I cannot go as high as a lightning, but we make up for it in speed by sailing offwind a bit more. Hard to beat the sloop rig for pointing ability. If looking for a race boat, class boats are better, as they have standards and competition is more fair and even between boats of the same kind. Lightning class boats are fun! But much more tippy, as initial stability is much less than a CS20. I feel much more at ease in the CS than I do in a lightning. I've raced quite a bit in lightnings. After racing for a while, its nice to get into the CS and enjoy the self tending fore sail and stability while single handing.