Thank you! Have you measured the 2000 MHz for the A35 cores after all that Amlogic cheating or are you trusting in some sysfs number?
Since you’re using the fake 1.5 GHz clockspeed in your comparison this is a serious question. S905X on your VIM 1 is clocked with ~1415 MHz and not 1512 MHz as the cpufreq driver claims.
‘Linux 5.4’ is really bad since it is an indication for S4 family (S805X2 / S905Y4) suffering from the same problem as T7 (A311D2 on your VIM4): no mainline Linux support in sight anytime soon or at all.
Edit: just realized that AV1 decoding is also missing in your comparison PDF. I thought all the time that at least this would justify calling VIM1S an upgrade over VIM1 