You can typically
see Cursed Energy Reinforcement, the concentration of energy for the purpose of bolstering their defensive abilities to the point of taking entire energy blasts head-on or their offensive abilities for the purpose of completely overwhelming their opponent.
Why do you think they constantly emphasize Yuji's physical prowess,
rather than his "20% above a normal sorcerer" Cursed Energy output, even when he uses Cursed Energy Reinforcement? Even though they are imbued with Cursed Energy, outside of reinforcement, which has its telltales, their physical abilities are still the driving factor; not every instance of a punch is an instance of Cursed Energy Reinforcement—the latter is nearly always referred to as a conscious and active ability.