Sennheiser HD 650 vs MEE audio Pinnacle P1

The sound signature is near neutral but with a little emphasis on the lower frequencies. The bass is slightly forward with good punch and tightness. Explosions will have good rumble, without overpowering the other frequencies.
The mids are warm and clear, adding extra body to the sound. Game dialogue will be easy to hear.
Highs have good clarity, but are not forward in any way, so harshness is minimized.

The H650 is popular for its near neutral sound, which makes it quite versatile. The headphones can give a great casual listening, gaming, and movie watching experience yet are accurate enough for pro audio mixing. They are also lightweight and comfortable so you won't have any issues wearing them for hours.

Clamping force is not too tight. The ear pads and headband feature memory foam which are covered by velour material. The pads feel really soft on the head and allow airflow for minimized heat build-up/sweat.
The headband also features similar cushioning materials and minimizes pressure spots on the head.

The open ear cup design allows the sound to blend with your surroundings, giving it a natural width. It will also be easier to identify the direction of sounds, which can really help immersion.

The HD-650s do not feel heavy at all. They are usable for long music listening, movie or gaming sessions without feeling pain or strain on their head and neck.

While the cable connectors are proprietary, they can easily be removed from the ear cups with a firm pull. The popularity of these headphones means that there are a lot of aftermarket cables that can be bought.

The value and craftsmanship that the Pinnacle P1 offers is hard to beat at this price range. They are durable due to the metal earpieces. The stand-out build quality is complemented by a detailed and balanced sound, braided cables and a large assortment of ear tips.

The sound signature is very balanced, with no frequencies taking over the rest in terms of extension. The highs are clear and airy, but do not sound harsh. The mids are smooth and rich yet are not too forward and do not creep up on the highs. The bass has good level of punch and extension, but is also controlled so there's no booming and won't muddy up the mids.
This sound makes these in-ears great for those who value sound accuracy over a fun and boosted sound, and as such work really well with all types of music.

The earpieces are made from a zinc alloy that gives them a solid, high quality feel. The thick and flexible cables, firm yet flexible ear tips and a leather carrying case are also similarly of good quality.

The cables have good thickness and flexibility. Also, they are braided and will not tangle easily, even when bunched up in a tight space like inside your pocket or bag.

Despite being made out of metal, the earpieces are actually quite lightweight. Combined with the good fit, these headphones stay in the ears pretty well without tiring your or ears or causing discomfort. This makes them very easy to wear for hours straight.

There are 2 cables included, one with an in-line mic/remote and the other purely for audio listening. This gives you the choice of extra functionality or a less intrusive cable with no dangling mic.

You get 6 silicone tips in different types and sizes along with 6 sizes of foam tips. Also included is a quality leather carrying case which should add extra convenience and protection when bringing these on the go.

The microphone produces sound with good clarity and detail, so talking over the phone with these should not be a problem.