Martin Logans- Narrow sweet spot, excellent imaging and transperancy. However they compress at volume. Very coherant, until the woofer takes over.
Current Ohm’s - Huge Sweet Spot, flat out do not compress, extremely coherant, nice imaging, but not as precise as the ML’s. Huge soundstage (if set-up right)
Current OHM’s actually do best in the live end of a room, they do fine near corners, jammed in a corner isn’t optimal, but where you have your speakers they will work fine. In many ways they do best set-up "opposite" of many traditional speakers.
The OHM’s will be a very different sound than the ML’s, though both have excellent midrange coherance.
When I had my Ohm’s (which I enjoyed a great deal). I actually felt they sounded best without bass traps in the front corners (though I’ve decided all speakers sound best in my room without the traps in the front corners, only the rears). But I also felt they sounded way better without my GIK panels at the first reflection points, though I did leave them up at the second reflection points.
Yet, where they were placed was darn near the same spot all of my speakers sound best. (sure, a bit of movement back and forth etc, but generally in my room most speakers sound best in the same area. Most rooms do)
To your original question - better is subjective. They will certainly be different. Better... that is all up to what you decide you like.