Well, there are 3 levels of brutal - Brutal, Brutality and Brutality Black edition, each one is previous one on steroids
Didn't play the Black Edition as I couldn't get it to load.
I play Brutality mostly, and Brutal.
Recently tried to play Brutality on hardest difficulty. For a guy who plays games on lowerst it was a challenge.
Chosen episode 1 as I know it the best, the secrets, layouts etc.
First level was quite easy when you know the 200% armor secret. Level 2 was already quite a challenge with alot of reloads.
Noticed that in such difficulty, secondary aiming (I never use in lowerst difficulty) is quite useful to increase accuracy, as you don't have time to spare in rooms of enemies for extra shots.