Another point for the 8361A for having an aluminum cabinet, don't know why but metal cabinets just sound better to me, could be psychological.Well we don’t know for sure since we do not have Klippell measurements for either the Genelec 8361A or the Neumann KH420. Both have polar response plots published by the manufacturer and both look fantastic. Both have SPL measurements available and both are also fantastic (though the KH420 has more midbass, midrange, and treble power, while the Genelec 8361 measures with a bit more bass power).
It seems like a close tie from what data we have now, but I would give the first prize between Neumann KH420 vs Genelec 8361A to the latter, if only because of the advantages you get from a fully coaxial design, and the additional built-in DSP, auto-sleep, and other advanced digital features.
And I have no idea what the KH420 is made out of