I can't really comment adequately on this topic because I discovered "Pure" and "Odyssey" at the same time.
Same here. I can hear a difference with some songs, but it almost seems more in the way she is singing than anything else. Take Heaven (from Pure) & Both Sides Now (from Odyssey), and there isn't much difference (some, yes, but nothing too drastic, at least not to my ears). However, if you compare songs of completely different styles, then there is a more notable difference.
Listening to her pre-International releases, I can definitely hear a difference. Especially when compared to songs from Treasure. I notice she has also loosened up & no longer seems to be trying so hard. (On her International releases, she never seemed to me to be trying too hard, but on some of the pre-International stuff, she did.)
I guess what I'm saying is that I can hear her growing more comfortable with her voice and style since the days of My Gift to You, much more so than I can a difference in her voice between Pure & Odyssey.
Pure and Odyssey, we are talking history here. I actually played Odysssey the other day, having played HSJS and virtually nothing else for the last three months. But in that time I have also heard Hayley perform live three times, so I have got quite used to what her voice sounds like now I was taken aback on listening to Odyssey by how much she had matured since then, and how much stonger and fuller her voce sounds now. To me, Odyssey felt almost like seing a movie I had seen many times in colour suddenly appear in back and white. Not that there is anything wrong wirth Odyssey of course. We waited for it a lng time after Pure, and were suitably impressed by it when it arrived. I felt that in her book, Hayley seems almost to apologise for Odyssey, and I don't know why - there is nothing wrong with it and I am sure it is a true snapshot of what she sounded like at the time. She still includes quite a lot of the songs from Odyssey in her live performances. It is just that she has since moved on to bigger, and in my opinion better things. We really need that new interational album to capture her voice as it is now.
I actually played Odysssey the other day, having played HSJS and virtually nothing else for the last three months. But in that time I have also heard Hayley perform live three times, so I have got quite used to what her voice sounds like now I was taken aback on listening to Odyssey by how much she had matured since then, and how much stonger and fuller her voce sounds now.
Perhaps that's my problem. I'm always listening to songs from all of her albums, shuffling them up or making mixed CDs for myself, so I don't get the full effect of the time period she recorded them in. If I listened to them as they came, and stayed with one for a while, before going back to a previous one, I'd probably hear things differently.
And I'm certainly awaiting her next International release, too. Not as much the Best Of CD, but one full of new songs.