Noise cancellation is pretty much identical. Comfort-wise the stellia feel lighter and initially more comfortable but the leather pads make my ears hot after a while which isnt an issue with the Elegia. I guess fit is quite a personal thing but for me the Elegia slightly edge it for comfort when it comes to long listening sessions. Sonic differences are far more pronounced and are becoming more so with every extra day of burn in (75hrs on the Stellias).
I'd have nothing to complain about with the Elegia, if i hadnt done any back to back listening and i still dont in terms of value for money. They would be my preference over every other CB until you get to the Stellias. As ive mentioned in previous posts i wasnt convinced listening at 24hrs, that the stellias were the complete deal. They had great seperation, more detail width and air from the off, but lack some of the body and the dynamism of the elegia. Things at the lowend improved greatly at 50hrs and now at 75hrs they just keep getting better, plus theres now more body throughout the presentation but no loss of seperation and texture. The price difference cant be ignored and as to whether they're worth the 2k premium, for me, i'd say yes definitely. In an audiophile world of diminishing returns i would say they offer a way better proportional return on investment, than similar step ups which ive made and been happy with in 2 channel hifi.
Its very big talk, but i think Focal have achieved something similar here with the Elegia and stellia's closed back tech as to what Rob Watts and chord did in DACs when they introduced the Mojo and the Hugo1, both of which were just so far ahead of any of their direct competitors or from many price tiers above.
Obviously there might be a bit of new toy bias rose tinting my opinion