A best in class digital marketer shouldn't differ much from a best in class traditional marketer. Just like a traditional marketer, a digital marketer must have a good grasp of the marketing science and its best practices. They must be ethical and truly passionate about what they do. Additional skills/qualities for digital marketers would include: hands-on digital work experience, keen interest in the development of the digital industry, and social media presence.
Best in Class digital marketer is a digital strategist vs just link builder or link dropper. It takes defining the fine line between a spammer and a good SEO. Playing by rules is the way to go , but you have to know the real rules of the game than what they tell you. Digital Marketer Eat , Drinks and Breathe Digital Marketing. There is never enough !