But given your progression in the amount of time it has taken, your body type and how it has 'filled out,' your bodies ability to respond to suboptimal sleep and nutrition habits, it is reasonably clear that your genetic expression is well above average in it's adaptation to strength training.
Let's be perfectly honest here. Imagine a scenario in which you, or anyone else currently training, is informed by a doctor tomorrow that you have the greatest "genetics" observed in the history of mankind.
What does that do for your training?
My guess is that the large majority of people see all aspects of their training increase almost instantly. Their work capacity goes up, as does their strength levels, and they make more progress, faster, than they were before.
Genetics matter. But there are a lot of things that matter. And chances are, every single person on here can find someone at an elite level with worse "genetics" than they. Cratos is not at a level in which his physique or his strength is genetically "off-limits" for just about anyone.
Here is what I have learned over the last few years:
A.) Most good lifters only "have good genetics" once they've hit a strong total. NOBODY told me my genetics were good when I started lifting. I was weak as shit and a lousy athlete in every other sport I had participated in. On my first-ever lower-body training session, I had a PT get me to quarter-squat 185 on a smith machine for a hard set of 6; I did two one-minute sets of bodyweight crunches and two sets of quad extensions before I was puking outside. I was sore for the next week, and I doubt seriously that anyone was impressed with my genetics (I was already 20 years old at this time).
B.) You can't change your genetics, and you can't see them. Some are etched visibly on your body (your height, your leverages, etc.), but most are not. If you can't change them, and you can't observe them, then you might as well fool yourself into believing you have the best genetics in the world. Your training will be better for it.
C.) Genetics are just one variable among many. Take an average person and have them put the same amount of time and effort into training as a world-record holder for a span of a decade: at worst, they'll be at an elite level by the time they're done. Genetics matter, but nobody ever reaches their genetic potential. Ever.
/rant