I was on Sapphire this past December, from San Antonio to Buenos Aires. We were supposed to call at Punta Arenas but ultimately could not due to weather. We did travel some inside channels on the way, and there was scenery, but it was also foggy, so not easy to see. There may have been glaciers, but we couldn't see them. The first two sea days were all ocean, if I remember correctly, with the third day being in the channels, close to land.
All that to say, it will probably be up to the weather and the captain's discretion what you end up seeing. Sorry, I know that's not the most helpful answer, but I think it's the most accurate I can give.
Here are a few examples of the views. Somewhat similar vibe to Inside Passage in Alaska.