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There is nothing poor about the M240 metrics as reported in DxO; they are top drawer, minimal differences are meaningless, and that is the degree of separation between the top FF sensors/cameras. It looks like catch-up after the M9 because it is.
That is great news for those who can afford the new M, as they have access to an unparalleled range of high quality optics, generally characterisable as low distortion, sharp, low complexity and exquisitely made.
For highest level image quality I would say they are in the top position - at present. That is a wonderful achievement for them, given their corporate size, the difficulty of the transition they faced, and the highly competitive enironment.
The RX1 is a special camera, equal best sensor with D800 and very high performance lens. It would be remarkable in terms of results even if it weighed as much, was as big and as costly as the new M body. It is the bargain camera in the high end 35mm market, for those for whom the 35mm FL suits their subject matter.
IF Sony make an ILC version with integrated updated EVF and 3-4 CZ lenses as good as the Sonnar 35/2, who with the money would resist?