The one you mentioned from, DR. NO, takes place before the kill. For me, it adds to the tension and highlights Bond's skills (Gosh, I guess Bond was paying attention THE WHOLE TIME!). This is one of my favorite scenes from the movies, because, without question, it shows that Bond is a killer. He has the advantage; he could just arrest the professor; yet, he kills him. A quip would ruin it. I prefer the tension.
The modern version of this scene, from CR, also works really well: "Yes. Considerably." It's not a quip and demonstrates a distinct coldness to Bond's character. After all, Bond was waiting in that office, looking at a photo of Dryden's family and it made no difference. Dryden is killed without hesitation. It's an amazing scene.
EXACTLY.
Two GREAT scenes.