A7 lacks the air that A6 has, making it a smoother experience. Have you tried to peel the cloth piece behind the A7 filters? It does bring back some air that was lacking for the A7.
LZ A6 with A7's red filters and Sennheiser IE 40 Pro's tips (foams included).
To me, the sound is slightly technically better than Monarch.
I just wish LZ wouldn't have made A7 so...safe. There is virtually no tinkering with A7, it is very good as is, but lags behind A6 in technicality.
I'm mainly using Black filter with foam mod on A6 and A7 on pop mode.