The recently emerging brand BQEYZ is not playing with cheapos. Each one of their models looks like a tank and is definitely built like one, and K2 is no different. Those weighty pair of all-metal earphones are not only visually-appealing in their trusty sturdiess, but also their sound is nothing to joke about.
Having a mature look, feel and sound quality, the K2 are a solid purchase that would not disappoint anybody. One thing I have to highlight is the lack of proper ear tips. You see, these earphones ø5.5mm wide nozzles. The ear tips are some generic ø4mm bore ones. Not only is it uneasy to apply the ear tips, but they also affect the sound drastically.
I think that if you can afford these upper-tier budget earphones, you should also be able to afford some proper wide-bore tips. Believe me, you will not be sorry.
As to which one I think is better - BQEYZ K2 or the similar-sounding RevoNext QT2 - then QT2 takes the lead thanks to it's more pronounced bass, even though K2 has the better cable.
First of all, change the ear tips to something more suitable. The included tips were definitely not made for these wide nozzles. I recommend using wide-bore tips, like the ones included with ROCK Zircon, or some of the whirlwind tips included with older KZ and Tennmak products. Fit and comfort with these earphones can change from one person to another, and it really depends on the size of your ears. People with smaller ears may find the bulky housings to be too large to fit in the ear, and will probably stick out. For me, the fit was quite good, but nothing like the amazing fit I get with earphones like TRN V80 and RevoNext QT2.
Lows / Bass
Once the ear tips are changed to some wide-bore ones, the bass gets quite extended and very pleasing. In fact, the bass quality and extension seems to be almost identical to RevoNext QT2, but just almost, as QT2's bass has more body, it is warmer and more energetic.
Mids / Vocals
Extremely similar to RevoNext QT2 and I could barely tell them apart. They are not recessed at all, but are also not edgy. The perceptional distance of voices and instruments from yourself is phenomenal. You will feel surrounded with sounds and will also be able to tell the direction from which the sounds originate. Not only that, the mids also sound extremely natural without any coloration, at least as far as I can hear. Those mids are as universal as it gets!
Highs / Treble
Also very similar to RevoNext QT2 and hardly distinguishable. Very detailed, crisp and sharp, but not fatiguing. Obviously, certain tracks (specifically under the electronic music umbrella) will still cause some pierce and it seems inevitable when it comes to bright earphones, especially those with balanced armatures located in the nozzles. However, those are some of the most extended and accurate-sounding highs I've ever heard so far. Certainly, you will get more sparkle with the extremely-extended treble of ZS6, but K2's highs will not tire you. Compared to the similar TRN V20, K2's treble is more accurate and detailed, less rolled-off but instances of pierce are far less likely to occur - and that what makes them truly worth their extra price.