FWIW, Galactus tends to recognize the Phoenix Force as a peer, chided her for wasting her power fighting him because she was drawing on the universe's pool of life-to-be, and the previous universe's Phoenix Force was half the power that made Galactus or the current 616 Universe (or both, maybe?).

OTOH, the Phoenix Force does not tend to have feats on that scale, especially when using a mortal host.