No it shouldn't be. Supposed to be on a similar general performance level. Based on the comments made about the X1/E11K combo being right there with the X3 original by those who had both. I had and know the X1/E11K and 770C are close so it seems to be the case. Though that brings in preference. Things close in technical level start become preferred by the signature they have. The warmer FiiO X3 or the 770C's more neutral would start to win on a personal taste basis for SQ. or other aspects of the physical design and UI etc. may make the choice for each person.