Yes you can follow users on kbin, which you can’t do on lemmy, and this applies to both users on mastodon/mblogs and lemmy/kbin.
However, from what I can gather, kbin is still community/magazine focused. For instance, I don’t think you can get a feed of just the posts of those that you follow, as you would on mastodon. You can select the subscribed channel and then look microblogs, which can get you close, but is really a view of all the posts from the people you follow and that have the hashtags for all of the magazines you follow (I think). THe important bit here being that kbin puts posts form mastodon/mblogs into magazines based on hashtags, where each magazine can defined what hashtags it will “scoop up”. And so “subscribed microblogs” includes all of those posts tagged with hashtags scooped up by the communities/magazines you follow.
I have no idea what kbin’s road map is for this, but for me personally, who has a mastodon account on an instance I’m rather happy with, as well as this lemmy account, it doesn’t offer something that would prompt me to migrate as a user.
One thing I’m probably missing here is whether one can more easily post to both communities/magazines and one’s mastodon followers from kbin. I don’t know enough about whether that is so and why and how far lemmy would be from achieving the same, but at this point in the fediverse’s development, it’s a not insignificant factor, as, IMO, so many are on mastodon and other microblog platforms that bridging that gap is vital to creating a sustainable and healthy ecosystem of platforms on the fediverse.