Dolphin's okay but it's missing some things that I really like using in Konqueror. For one thing, I use the split screen function a lot and Dolphin only allows you to have two split screens, while Konqueror lets you keep splitting them.
Another thing, maybe somebody can tell me how to do this, but in Dolphin when I hover the cursor over a .png image there's no image preview like in Konqueror. Yes, I can switch over to Previews mode in Dolphin, but I'd like the hover-over previews, too.
Also, no Services side panel in Dolphin, which comes in handy for me in Konqueror. And, no tabs.
I do use Dolphin a lot, but I end up going back to Konqueror for a lot of little things.