Swifties need to stop lowering Katy to Taylor's vocal level to make the difference seemingly insignificant. There is a significant difference and that really tells you how much room Taylor has to improve on her vocals.
I'm not saying she's Beyonce or anything but I think she's got a lot more natural charisma than Katy, and has more of a presence on stage tbh. I'm not talking about props and costumes....she just looks more comfortable up there.