wchiuDo a quick search of “K7xx vs k702” and you’ll quickly see it may or may not be worth it in your case. TLDR: If you hate bass and want a really “bright” sounding phone go for the K702. If you want a little more bass and warmth go for the K7xx..
The K7xx should sound more bass heavy than the K702’s due to having different drivers and thinner cheek pads.