I did a quick comparison of the GTA V gameplay footage and footage from Max Payne 3. Very similar with slight but important differences...
1 - Franklin's crouched-walk approach to the car is much faster than MP3, it's a little hard to tell here because the MP3 character presses the cover button from further away which smoothly automates to the car. This "fast crouch" was present in both Episodes From Liberty City and Red Dead Redemption, but not GTA IV.
2 - When Franklin is walking toward the building while firing from the hip, he is walking a bit slower than the MP3 character, but when he brings the gun up to his shoulder on the 5th and 6th targets, the walking speeds seem the same.
3 - The GTA V camera has been backed away from the character a bit so that you can see more of your surroundings at once.
Probably tons of other small differences as well, but you can count on great controls that you will learn to love (if you haven't already).
[The timing has been adjusted slightly in parts of the Max Payne 3 footage because of inconsistencies with the captured performance, but you get the idea.]
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