I was just reading on the Four Metres forum of a really outstanding QSO made this week. Nige, G7CNF and Mike, VE9AA made a 70/50MHz crossband contact on the evening of Tuesday, 25th June. Nige, of course, was transmitting on 70MHz and Mike on 50MHz.
Though this path has been worked before, to my knowledge it has always been by F2 rather than multi-hop Es.
Well done Nige and Mike.