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Well, the most obvious showing of Luffy's progression is his dealing with Bellamy.
The Man was far superior as a fighter to what any of his East Blue opponents, and he finished him with one punch.
Luffy was trained extensively for 10 years (from when Shanks left the village [and seemingly even before that] to the start of the story}. As such, he built up most of his strength and speed then, and has been continually experimented with different attack styles, trying to perfect his use of his powers.
An example of this is him seeing how a pinwheel attack he used on the seacow in the arlong park arc. As such, we havent seen him return to that attack, with justification on having learned its major weakness.
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