head to head
Dishonored asks more than Grand Theft Auto V, and the gap is optimization.

Optimization · Practiced Mastery
The first Dishonored: a stealth-action playground of layered powers.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Dishonored leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dishonored
Blink timing and combat inputs matter.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Dishonored
Guard AI scripted, non-adaptive.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dishonored
Patrol timings vary mildly.
Grand Theft Auto V
Some mission and lobby randomness.
Dishonored leans clearly harder on optimization.
Dishonored
Power combos and stealth routes solvable.
Grand Theft Auto V
Heists, money loops, builds learnable.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.