Sure did. Been keeping aquariums since I was a kid. Through the years had all sorts of sunfish, hybrid sunfish, some other natives plus some petshop fish. While looking for some more natives at a local pond, I spotted a huge koi and tried my best to catch it, but after about 10 trips couldn't. So just bought a pair of koi at a local petshop.
They were so friendly, grew so fast, and so neat looking that I upsized my pond and have adopted out all other fish, and just have koi now.
I know this forum is mostly about fish other than koi, and I think all the others are really cool too. But for me, I am hooked on koi.