Forgive me, Father, for I have sinned:
I have a SRAM/Quarq crankset on an otherwise all-Ultegra bike. I have a Stages crankarm on an otherwise all-DA bike. I've got a CX bike with Shimano/Stages/SRAM. My kid's road bike has a SRAM crankset on an Campy Chorus/Centaur bike. Oh, and my kid's CX bike has an FSA crankset on a 105/Tiagra bike.