Does the sound quality from a CD differ from a direct iTunes download?

I love Les Mis 10th anniversary' sound track, so I downloaded it from youtube to my iphone. However, the sound quilty isn't that great, no matter how 'hq' the video is, it sounds abit muffed on my iphone.
The album is so expensive, £16, so I thought id buy a CD to download to my iTunes then to my iphone.
Will these tracks from a CD sound the same as those tracks provided by iTunes?

Yes, of course. In terms of dynamic range, signal to noise ratio, distortion and frequency response, the CD is pretty much impossible to beat. The amount of information packed on to one disc is mind boggling. I don't even want to hazard a guess. Compared to what you get from the compressed, paired down, noisy, tinny version from, iTunes it's not even comparable - "HQ" or no "HQ."

To this day, the quality of audio CDs has never been equaled. The only rival is the vinyl LP with its analog sound which, when played by a true high fidelity system (not a Crosley record player), is comparable to a CD. I won't get into the debate between high fidelity analog vs. CD or lossless digital.

For more information see this article:

https://en.wikipedia.org/...ompression

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