You guys are stupid. There is a better way of telling him diet is key then telling him cutting on steroids is similar to doing it natty, because it definitely is not even fucking close. I'm sick and tired of people giving false information on a steroid forum just to get a point across.
Apex, the truth is, if your diet is not perfect and very, very strict when cutting, even on steroids, you will not get great results. If you do have your diet and workout down, and it is on point, then you will get shredded, and pack on some lean mass in the process. There is no way in telling how much fat mass you will lose on a cutting cycle. It all depends on the person, your diet, your workout, and, in a smaller sense, the compounds you use.
I am an endomorph, I pack on fat easily, and it is very hard for me to burn it off. When on a Test cycle, I can get under 5% bodyfat, pack on a lot of lean mass, and just look completely shredded and jacked in a matter of a couple of months. I can do this because I know what foods work for me, what workout is best for me, and how my body works. Keep it mind this is only taking 500mg of Test a week. If I add in something like Tbol, the lean mass gains increase significantly. This is all on an extreme calorie deficit as well.