Been playing Leona a bit...
Pretty sure she's the only support that can build full tank and easily outduel a carry (until about level 11 where they get some sustain from BT/Bork etc.)
With sona/lulu/karma etc. you need to build ap to do that with her you dont need anything but your full combo and you can easily outtrade. It's honestly stupid for someone who basically never fking dies most of the time
