Just wondering if anyone compared the E7 with an Ibasso D4 Mamba?

I've got myself a pair of SR125i's a few weeks back. I have a Sansa clip and I've been using it on my laptop most of the time (home use anyways) and I find the output from my laptop to be decent......... UNTIL......... my mate came over and plugged in his gamma2. Sound felt much more detailed and 'full'. Soundstage seems to open up as well.

So I've been looking around for alternatives. Was looking at the D2+ and it looks great! Not sure how it sounds but reviews seem to compare it with the E7. And the E7 looks great too in my opinion! and at its price, I guess its a real bargain.

After further scouting I found the D4 mamba which...... is gonna stretch my budget a little but I was just wondering if it won't be much of an improvement over the E7? I've never tried any of them though and I'm stuck in the UK. I basso products cost an extra arm compared to Msia but the E7 is just a little more expensive