We've never seen what Escanor is capable of at his peak. However, he solidly outperforms full power Meliodas, even when only in a suppressed form.
Assuming all are bloodlusted, Ban winds up as the only survivor after he kills Escanor after sunset. And Escanor would kill Meliodas and King after a good fight. Ban only survives because he's immortal.
I don't think so. Escanor would solidly beat them all at once, if he was at full power. Even Meliodas stated that Escanor at his most suppressed was stronger than he at his best. Ban and King would honestly just be fodder, and even Meliodas would be bested almost immediately.
However, I reserve that Ban would survive and kill Escanor after sunset, just because he demonstrably can't kill Ban.