If they don't share any outs you have less than 1/3:
http://twodimes.net/h/?z=2192225
pokenum -o ac jc 2h 2d - qc 3h 5c 7d - qd 9c td kh -- qh qs 2s
Omaha Hi: 666 enumerated boards containing Qs 2s Qh
cards win %win lose %lose tie %tie EV
Ac Jc 2d 2h 189 28.38 477 71.62 0 0.00 0.284
Qc 5c 7d 3h 198 29.73 468 70.27 0 0.00 0.297
9c Qd Td Kh 279 41.89 387 58.11 0 0.00 0.419
But if you can fold one off then it's much better:
http://twodimes.net/h/?z=2192226
pokenum -o ac jc 2h 2d - - qd 9c td kh -- qh qs 2s
Omaha Hi: 820 enumerated boards containing Qs 2s Qh
cards win %win lose %lose tie %tie EV
Ac Jc 2d 2h 474 57.80 346 42.20 0 0.00 0.578
9c Qd Td Kh 346 42.20 474 57.80 0 0.00 0.422
Go for the push.