Canon are more than capable of building an optically stellar RF 35mm prime and its fully expected that it will be than the EF mark II. Only question remains is whether it will be f1.4 or f1.2 but I guess it will be an f1.2 to complete a holy trinity of primes.
I'm sure I'll get the 35 L, despite having the 28-70. At first I sold my 50 1.2, thinking it was redundant having both, but the 50 is considerably smaller and lighter than the 28-70 (and of course is a stop and a third faster), so I bought the 50 again LOL!