It's a little hard for me to answer but I also own the A8 and dearly love them. The EJ07 will likely sound more deep, much better bass below 40hz, has more rich mids where the A8 is a hair 'dry' but excellent. The A8 has a more typical BA treble section though EXTREMELY well controlled and tuned. Its wonderful. The EJ07 has more natural treble thanks to the EST drivers (to me). It also has more 3D deep/wide/below/above sound stage.
I'd say if you love the A8 the EJ07 will make you REAL happy. The EJ does elctronic/edm/rock/punk freakin great! Knocks it right out of the park.
The Conductor does all the EJ07 does with a slightly flatter signature. Conductor is slightly more balanced and less V shaped. Some music such as acoustic instrumentals sounds maybe richer with the Conductor and the EJ07 does better with badly recorded stuff since it is a bit more forgiving. They are both amaaaaaaazing!
Thanks so much for replying, really helpful love your reviews btw!
If I wanted a different experience than the A8, would you recommend the Conductor instead? Although I am leaning towards the EJ.