Based on the M4 i’ve seen in PB and various 3-series in PB i wouldn’t say it’s a “normal” blue. It has a very special shining especially in the sun, seems to have a little purple in it.
At night I actually love this color!
But I know what you mean, you love Yas Marina and Portimao is far from that.
I think they just decided to bring in Green (which also looks very good) instead of bright blue, just to make something different I guess.