The phrase 'is more expert' is correct and usable in written English.
It is commonly used to compare two things in terms of expertise. For example, "John is more expert at fixing cars than Mary."
If there is a disagreement, the opinion of the cancer center that is more expert, which may reflect the judgment of multiple doctors, carries more weight.
Other developers say that no one is more expert in layering the available sources of financing, a task so time consuming and complex that few attempt it.
It means that a child is capable of doing something so beautiful, but if you put the same child next to an adult who is more expert at doing something it can produce something even better".
This behavior is more expert-like than the behavior observed with the control and SPSA students.
This approach is designed to encourage students to enter a stage of "conceptual conflict" and to replace their novice construct with one that is more expert-like (Kampourakis and Zogza, 2009).
While earlier studies using the same or similar surveys have reported similar results, that is, more expert-like attitudes in fourth-year students than in first-year students (Bates et al., 2011; Semsar et al., 2011), our study is among the first to report longitudinal results of student attitudes over a 4-yr period.
Regulators, in theory, are more expert than politicians, and less passionate.
I know ex-players are more expert than the likes of me, but come on".
Certainly, few actors have been more expert at the smoothing of feathers, or had more of a knack for the mot juste.
It was claimed, for example, that the companies contracted to do the site were more expert at negotiating the 1,800-page 1,800-pageocurement manual than at designing web services.
Recently Obama has brought in people who are more expert on labour issues, but they have to deal with deep-rooted rot in the jobs world.
