In the first sentence you are making a comparison--it was as impressive as something else. In the second sentence you are just making a statement about one thing.
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martinleeThis was quite as impressiveI don’t find this very natural. I would only use quite as [adjective] in negative contexts:
CliveSeems natural to me.However, it should be noted that only three of the first 120 citations for quite as [adjective] in the COCA occur in an affirmative context.
Aspara Gus I would only use quite as [adjective] in negative contexts:My thought exactly!