With a good cut of steak, you want char on the outside for the chemical Maillard reaction that makes charred meat taste so good and medium rare, tender meat on the inside for complementary texture and flavor.
Deep frying, as mentioned, adds way too much fat and cooking inconsistency.
I'm trying to get my sous vide steaks right but, so far, a reverse sear using indirect heat and then direct heat still results in the best cooked steaks.
The "choice" ribeyes I am using may be part of my problem. I'm going to pick up some "prime" steak to see if it's my methods or if it's the meat.
Don't get me wrong. I seared the sous vide steak in a cast iron pan and then used the fond/drippings to make a mushroom, red wine, cream sauce so the steak with the sauce was amazing. Still, it wasn't the best steak I ever had.
Getting back to the topic at hand, no. Just no on deep frying.