I just wrote this comparison in the Pioneer DJE1500 thread. Since it is a comparison against the S5 I thought I would post it here as well.
OK, I did an A/B comparison between the S5 and DJE1500 using my LG G2 at 50% volume, in both IEM's I used the stock tips that fit me best. But have put some notes in the text where I know different tips will change the sound.
Breathe (in the Air) - Pink Floyd
DJE1500 - The bass for this song is the right strength with good decay and texture and good impact. The midrange sounds very full and detailed, there is no sense of hollowness or anything missing, the midrange simply blends in perfectly with the bass. The treble is fully present in the lower registers and possibly slightly rolled off in the upper registers. The sound stage and imaging is large and extremely well placed.
If I switch to UE tips the treble becomes extended more to the upper registers and the upper midrange also becomes stronger. Sony tips make the bass on this track much heavier losing some of the texture. The midrange also becomes warmer and a bit more intimate. The treble looses some of it's shimmer and detail as well.
S5 - Bass is about the right strength for the song but lacks a bit in texture while having good impact. The midrange sounds sucked out and a bit hollow. The midrange has this issue from the lower mids straight up through the upper mids. Treble is bright and sparkly with a stronger emphasis in the upper treble registers. It is as if the midrange and lower treble all are a bit laid back in the song. This give the vocals and instruments a distant almost feel and causes the cymbals to sound very bright and tinny. The sound stage and imaging is average with instruments not sounding as well placed.
If I switch to UE tips the treble becomes even more clearer but the midrange also become a bit clearer, it does not remove the sucked out feeling of the song but reduces it a bit. Sony hybrid tips make this song sound much better! The cymbals sound more natural and the midrange becomes more cohesive but you will lose some of the detail in the process.
Using stock tips I think the DJE1500 handily wins with this song. But the UE tips sound the best to my ears with the DJE while the Sony tips really helped out the S5.
I will a similar comparison on Patricia Barber's Code Cool and one classical selection when I have time.