Some feedback from our superusers: 

The option for marking answers should be swapped with the Like button. When they get superuser status and capabilities, they inevitably have a tough learning curve to adjust where they click when they want to like something, as the ✔ button is now the left-most button, rather than the like. 

While they inevitably get comfortable with the new UX, I do see their point: 

• Like is the left-most option for all nearly all post types (question, article, conversation, product update, and replies on ideas. 
• It’s a bit odd that ✔ then moves in to change the UX on question replies, while Like is still left-most on the majority of posts

I can imagine the downside is that the less prominent you make the ✔, the less likely it is to be used. 

But given some of the considerations for future improvements to the real-time experience, I think this is a pain point you should be aware of.