Black beans, for example, have a PER of 0 (unrealistically low) and a PDCAAS of 0.75 (unrealistically high, vs 1 for egg). A realistic comparison can't be reduced to a single scalar, but for my own personal dietary requirements, I would probably want to eat 5-10x as many grams of nominal protein from black beans as from beef. This would be very challenging.

I think some other beans like kidney beans fare somewhat better, although I don't recall numbers. Still not close to mammal meat.