Actually, high quality JPEGs are just as good as BPG, VP8, etc:

https://people.xiph.org/~jm/daala/revisiting/subset1_psnrhvs...

so when you use a better encoder like mozjpeg, JPEG is actually competitive with the newest formats, given enough quality

it gets slightly grainier results with blocking artifacts, but BPG and WebM look like they had a painting algorithm blur out all of the details