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You really didn't have to post the specs, but nice of you to do that (they're a bit off though). Indeed, on paper they're great competition for eachother. The only problem is the CL is a luxury vehicle that weighs 2000+ kg. It has awesome power (the limited 738 lb-ft @ 2000 rpm is just, wow), but isn't a great handler.
The 6 series, especially the M6 is more sport-oriented. That's where the CLK comes in. It's a coupé, and a lot more nimble than the CL. The 65 version of it is still a bit left behind. Mercedes wants to make the CLK AMG versions not only powerful, but handle aswell. Improvements are being made as we speak. If PD is up to date on the latest specs, a 65 version would be overkill in that case, so the 55 is more appropriate.
The 6 series, especially the M6 is more sport-oriented. That's where the CLK comes in. It's a coupé, and a lot more nimble than the CL. The 65 version of it is still a bit left behind. Mercedes wants to make the CLK AMG versions not only powerful, but handle aswell. Improvements are being made as we speak. If PD is up to date on the latest specs, a 65 version would be overkill in that case, so the 55 is more appropriate.