I never directly compared the Acmes to either the EMLs or the KRRK. I preferred the Elrogs to those two after comparing each of them to the Elrogs directly. Then, recently, I compared the Elrogs directly to the Acmes.
I would say it's safe to extrapolate the attributes the 805s brought to the table to the the 300Bs doing the same.
Compared to the Elrogs, you lose some mid-range magic and a sense of glow around instruments, but you get more resolution, see-throughness and clarity with the Acmes. Soundstage is similar but bass reproduction is better as well. The beauty lost by removing the Elrogs was easily replaced by tuning other areas of my chain.