It would be great if you could compare the Illumination to the EX1k!
I have the Blessing 2 and the EX1k at hand. I find the Ex1k more dynamic and more engaging, with higher clarity, a bigger sense of space and a darker background. It also sounds effortless and has that beautiful, controlled and extended bass.
The B2 is a little flatter in it's presentation, with less contrast, but presenting the music with a little more focus on the details, making them stand out more.
This track really shows the dynamic and separation capabilities of an IEM:
https://tidal.com/browse/track/77607310
Especially towards the end it's a really tough track which can break up easily.
And the one I used to compare the details is Katie Melua's "Shy Boy"
https://tidal.com/browse/track/63658097
Listen for the part from 1:50 to 2:20, I listened specifically for the definition of the very quiet bongos (or something similar)