I haven’t flown into Queenstown but have flown out of it. Short of taking a sight-seeing plane over Fjordland or Mt. Aspiring its hard to imagine a more lovely flight. My tip to anyone ever flying out of there is to make sure to nab a window seat. The views of the mountains and glaciers are stunning.
Going into to QT you fly down into and through a canyon. You can actually look up and see cars, sheep, etc, and you’re still 10 minutes from touchdown - it’s like the wingtips are going to scrape the canyon walls - it’s really something. I’ve only done it in the summer, I can’t imagine what winter is like.