I'd say the Neumann's will sound most similar to the Genelecs. Similar controlled directivity and overall neutrality. Both those Focals will sound quite different, as they will have significantly wider dispersion, especially in the lower-mid treble.
Personally I'd avoid the Twin6 - the driver layout is unnecessarily compromised. Actually, the Solo6 was measured by Sound&Recording:
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You can actually see how much wider dispersion they are in the treble there. Definitely not super accurate and
certainly not controlled-directivity, but if you're looking for something to give you an alternative window onto the mix that is probably more similar to a lot of conventional home audio speakers than the 8351, they will be that
And they appear to play very clean for a speaker their size.