It is conditionally better oil. If you put regular Mobil1 in my BMW, ESP will outperform it because. various factors, like much higher heat retention in N52 compared to 2GR-FE.
But in 2GR-FE, being "cold" engine, I would prefer thinner stuff (not too thin like 0W20, I used that twice I think). Also, ESP has high HTHS, which means more drag. So, you will create bit more drag (not sure you will notice) for no real benefit.
I think the most important thing is the final outcome, not as much as what is inside.
That being said, I also used M1 0W40 in 2GR-FE, just out of curiosity, like you.