We trialled a GK list of 1 Librarian (Quickening and Vortex of Doom) and 2x Strike Squads with 1x Psycannon, 1x Hammer and 3x Falchions.
Did unbelievably well against everything but the Ork Deff Dred list (Buzzgob, 3x Deff Dreds with nuthin' but claws, 3 x Killa Kans with Skorchas). The Deff Dred list could only win by killing the enemy - a task it did pretty well at, though it usually lost.