I see two other people have posted with a different viewpoint to me on the sound, which shows how individual earphone sound is. I just did a few tests pro 3 against pro 2 and a Fiio KA7 DAC with Soundmagic E80 earphones.
They all sound slightly different. None are particularly objectionable, the pro 3 is closer to the E80 than the pro 2 is as they sound more muddied and flat compared to the E80 and pro 3, which both have better clarity and attack.
Personally I prefer the sound of the E80, but carrying around a DAC everywhere isn’t ideal.
I think ultimately it’ll come down to individual preference.