Let me try to help you out there. The Roxnnes would be closer towards sounding like the LCDX or the XC's more than the 2/3. The SE846 sound sound closer to the 2/3's. Hope it helps. Side note. Mine is the universal version of the Roxannes and I own the 2 and X. But auditioned all four extensively before settling for the 2 and X. Hope I can help further if you have any more questions.
I only listen to LCD-2. At least on the bass/low mids part, it is comparable to Roxanne. It has the familiar thickness, fullness and the hard/deep kick on the low end. But on the treble part they are not the same. LCD-2 is more laid back/rolled off compared to Roxanne.