The best DD5 engine module I currently own is that of my Vulture. It has 137% optimal multiplier with a minimal mass value I can stay under almost in every possible combat configurations (thanks to engineering other modules). This modification took about 80 rolls to get (actually it took ~50, as the rest of the rolls did not improve the drive any further). If we count rolls I spent to engineer my other 6 ships (none of which has a better drive), the grand total of DD5 rolls I made throughout my 14 months in ED amounts to maybe 300.
With said DD5 engines my Vulture boosts 540 m/s, 4-pips speed is 333 m/s, pitch rate is 67°/s.
I may have rolled 1000 to get a 140% optimal multiplier god roll and, had I been extremely lucky not to ruin the optimal mass figure, I could have ended up with a ship that can boost 550 m/s, fly 350 m/s with 4 pips on ENG and pitch 68°/s.
This is 1 or 2% difference.
How many players are there in E

whom I cannot defeat right now, but would be able to kill if I had the god-rolled drive?
Just off the top of my head, all of the following factors are likely to have much more than 1% effect on the outcome of such battles:
- the ship models flown,
- the combatants' current loadout,
- combat experience,
- genetics,
- age,
- number of empty beer cans on the table,
- angry wife and brawling kids in the background, bad day of your boss, and suchlike.
Level playing field is an illusion. There is no such thing.