No matter the specs, I wouldn't want to use a camera that doesn't have a viewfinder. ... If you don't care about viewfinders, then the X2 seems like it will probably be a good camera..
EVF viewfinder is available for the X2. Its actually the VF2 originally made by Olympus for the Pen cameras ( I have one) and rebranded a Leica. The EVF is actually pretty good... good enough to focus adapted manual lenses.
With that said, I rarely use my Leica.. er.. Panasonic LX3 since I acquired the Micro 4 3 system. I like the LX3 but the versatility and availability of optics for the Micro 4/3 really trumps any fixed lens compact. For the same reason, I would take a micro 4 3 system over the X2. More specifically, an E-P3 (or OMD EM-5) with a couple good fast primes.. there is a nice selection of them in micro 4 3 mount.
As a side note... Glad the OP likes the Dlux5 but I'm trying to figure out what the OP means by "it is a True Leica"..... :er: By what standards or in respect to? Operation? feel? hmm...