I have worked with a few (I did due diligence / site selection analysis for clients, the agents had the properties listed that were under review).
Commercial versus residential:
-- have longer sales cycles, and equal amount of sales effort needed to get clients. The best ones have long term clients with repeat business.
-- need to understand tenant / lease contracts (commercial ones), and typical negotiations, which as you may know, have many more points to potentially negotiate
-- typically need to understand business finance better. Need a good business / math analysis ability. some actually need to hire or use a designated person n the office for this. The sale happens because the overall business profit is better at location A than B. If the agent can show that, then they are more likely to get the sale.
-- may need to understand the basics of construction and / or tenant improvement process
ETA -- when the client has money for reviews, and the commercial agency does not provide the above, that is when I would be given a job. I lost a lot of potential business* to the great commercial agents who could competently walk the client through all of the above. (*But it is all good, if the customer gets what they need)