Those speakers are almost opposites. The EVM 12L is much more efficient and would probably overpower the Celestion to the point that you wouldn't get to hear much of the Celestions benefits. The EVM is cold and sterile by comparison and has little distortion or compression where the Celestion has great compression. The EVM's high end is fairly bright, where the highs of the Celestion has rolled off highs and is very warm.
G12H-30/G12-65 is a GREAT combo. Though the G12H-30 is more sensitive the G12-65's mids make up for the difference. I wish I could find one speaker that sounded like the two put together. bob