The Scarlet in 3k looks pretty similar to the RED One in 3k. Low light performance is nice, and it shoots R3D files with the same workflow as the existing RED Cameras. If you can get hold of some RED footage, it will tell you what it's like, and because it's raw, you can "develop" it with whatever curve you want to match existing cameras.
As Shane points out, Scarlet is very much professional, but a smaller / cheaper camera than the Epic. As always with any purchase, test and research beforehand.
Graeme