Regarding the Jeep references, yes the 6 speed manual in the Crossfire was and is used in Wranglers also. But, it was a Mercedes unit adapted for use in Jeeps, not the other way around. It was used (obviously) in the SLK 230, the SLK 320 and in the same vintage C class sedans. The spread of ratios 1-5 is low (relatively) for acceleration, which is good.
5th gear is 1:1, rather than 4th being 1:1 gear which is usually the norm in 6 speed applications.