SQL Server - Include NULL using UNPIVOT

Question

UNPIVOT will not return NULLs, but I need them in a comparison query. I am trying to avoid using ISNULL the following ex

Answer 1

or, in SQLServer 2008 in shorter way:

...
cross join 
(values('col1'), ('col2'), ('col3'), ('col4')) column_names(column_name)