Migrating Sybase SQL Anywhere to MS SQL Server

A company for which I do some development work may get a contract to
migrate a Delphi 5/Sybase SQL Anywhere application to Delphi/MS SQL
Server.

Does anybody have any experience with this? What sort of problems might
we run into? Would this be rather straightforward, or would there be a
lot a rewriting required for things such as stored procedures?

Thanks
Bill