Overnight I was on 6m MSK144 RX only on 50.280MHz. So far only M6GAN (122km) spotted, presumably by aircraft reflection rather than random MS. This was in the hours before sunrise.
So far, I have spotted 6 countries on 6m MSK144 in totally flat conditions with Italy being the best DX and my 6m set-up is very average, if anything below average!
UPDATE 1930z: Best DX on 6m MSK144 today are EI7BMB (462km) and F4GTG (654km).