Not blow it away, but there is an improvement.
DTS is what is known as "lossy" compression. Much like MP3, except DTS is far worse from an efficiency standpoint. If you are using bluray as a source, the DTS core is 1536kbps, which should be all but indistinguishable from the lossless DTS HD MA. There could very likely be small differences on some content however, applause, rain, and impulse sounds, but it's highly variable.
I'd say that an upgrade for lossless audio alone isn't worth it. Especially if you plan on sticking to 5.2. Some Avrs do offer other features like room correction, 7.1/Atmos, etc, that would be worth an upgrade if you planned to take advantage of them.
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