Hi Krismarzyk,
I have both and and I can, with difficulties, say that the EM32 are technically better than the pro330 but really near in terms of note weight, details and musicality. Nevertheless in terms of tones the EM32 is a bit more realistic on voices, bass drums and cymbals, eg, due to a better extension and transparency.
But the note weight is very similar. The attack and decay of the EM32 is a bit slower than what the pro330 know to do and in the same time both can offer almost the same level of details but the EM32 have a better sense of details and resolution because of his transparency. With both you seem to hear a speaker but the difference is that the EM32 are the speaker and the pro330 sit you in front of the speaker.
The sound signature is different as the pro330 are more focused on high mids versus the EM32 that are more focused on bass mids/sub bass. Both have liquid treble and smooth mids that are absolutely not sibilant, that's why I love them both at the same level : they are complementing each other. Both are bass capable and offer an organic restitution that can rumble when bass are called for it. In terms of quantity the EM32 offer more sub bass, the pro330 more high mids.
The sense of transparency on both is top class, but the EM32 are more clear, less veiled, and bring more resolution on timbres. But both have the same philosophy of sound, they tune their CIEM in the same way of naturalness with a different touch on the sound signature.
Regarding to the soundstage the pro330 are more in the head, less width and deep but their deepness is just well done and airy. The EM32 is a bit more realistic in terms of instruments position.
As I say above, the musicality, the restitution of harmonics impressed me on both. Piotr and Franck have tuned their CIEM with golden hands and ears, they know how sound an instrument and where on the graph.
To my mind the EM32 are a good bang for the buck CIEM, but the pro330 even more. I can explain myself why I pay 300€ more for the EM32, but imo pro330 have to cost 800€ instead of 575€.