Great post, and this is the best analogy to use to compare the SuperGrafx with present-day consoles.
The GPU in PS4 Pro (4.2 TFlops) is about 2.3 times more powerful than the OG PS4 and PS4 Slim (1.8 TFlops), and has a somewhat faster clocked CPU (2.1 GHz vs 1.6 GHz)
The GPU in Xbox One X (6 TFlops) is about 4.5 times more powerful than the OG Xbox One and nearly 4.5x the Xbox One S.
The SuperGrafx has twice had a second graphics/video processor, allowing twice the sprites as the PCE/TG-16 and a second background layer. The work RAM was quadrupled from 8k to 32k and the VRAM was doubled from 64k to 128k. The CPU was not any faster. So the leap from the PCE/TG-16 to the SuperGrafx was a bit less than the leap from the PS4 to the PS4Pro and much less than Xbox One to Xbox One X.