I am new to audio everything. I listen to music every chance i get but I always use portable devices from creatives older mp3 player, the very first ipod mini to now my Nexus 5. I mostly listen to korean hip-hop, rnb, acoustic and some pop. I would like to get my hands on a nice set of cans but I don't want to attach an amp or dac to my phone. So my question is will a good pair of headphones make a difference when i listen to music on my Nexus 5 or any pair of headphone would suffice? For comparison if i buy the Sennheiser momentum over-ear will it outshine my current sony piiq marqii's with a straight plug in to my Nexus 5? Will i be even able to tell the differences if i don't have an amp or Dac connected?