Stacked Large Advents v Cornwalls v Klipschorns

I currently have Advents and have always liked the sound. Please only respond if you have actually heard or ownedat least two of the three options I’ve listed. Will either Klipsch model(purchased as a used/older set) be a noticeable upgrade? What will be the benefit (what am I likely to hear) that makes the purchase worth the added cost? Thanks.