I was listening to the Elear last night for about 4 hours with the C5 (dac version) and it sounds pretty good with the bass boost switch engaged.
Without the bass switch engaged the sound is fairly lean compared to what the Elear sounds like out of a full sized amp.
I think that is something people need to be aware of with this headphone. Focal's design intent is/ was very clearly for home use, through full sized equipment. No 3.5mm adapter, a massive cord, no travel case, very open architecture, and an 80ohm driver rating (even though sensitivity is relatively high).
It's major selling point, for me, is the dynamics, weight, punch that it portrays music with. It does the bass head punchy thing while still giving you world class mids and treble. A pretty remarkable accomplishment.
But (Big But!) that rich, dense, dynamic weight that it is so good at, seems to fall off significantly when connected to portable amps.
WIth all of my portable amps, ALO National, iFi iDSD and to a lesser extent with the C5 there was a pretty significant performance delta... and it wasn't about the DAC section because I fed my big rig amps with the dacs on the portables and it sounded outstanding.
Whether it is because the driver is overdamped with too low an output impedance (ala AKG KXXX series) or because battery powered amps typically don't have large capacitor banks for reserve power.... I couldn't say, but something doesn't translate.
I haven't personally heard the pairing but I tend to think the Mojo is going to fall in this category as well. The Mojo wasn't designed for full size cans and the Elear clearly wasn't designed for portable use.