I've heard it said that Sam had mentioned at one time that if you compare a character with 40 strength to a character with 50 strength, the 50 strength character is actually TWICE as strong as the guy with 40 strength. That means that every 10% up the scale is exponential. A guy with 40 Intelligence would be twice as smart as a guy with 30 intelligence and so on. What this doesn't account for is a measurement of strength bonus.....or would it still apply?
If so, it sort of helps the universe make more sense to me in terms of the scale of power in 40k when compared to your average joe. A Bloodthirster with a strength in the 90's goes from super strong to epic-strong and seems more capable of challenging an army properly!
What do you all think? Is this confirmed anywhere in the books?