SQL Server: Get All Databases Size

To get recent size of all databases on an instance, I have found following simple query very useful. 

SELECT  d.name,

        ROUND(SUM(mf.size) * 8 / 1024, 0) Size_MBs

FROM    sys.master_files mf

        INNER JOIN sys.databases d ON d.database_id = mf.database_id

WHERE   d.database_id > 4 -- Skip system databases

GROUP BY d.name

ORDER BY d.name