When comparing Oracle dates to SQL Server I have found that it only works when the Oracle and SQL dates are strings.
Therefore in your Oracle query add a new column like this:
TO_CHAR(SYSDATE,'DD/MM/YYYY') as DATE_STRING
then in your SQL Server query add a new column:
CONVERT(VARCHAR(10), GETDATE(), 103) AS DATE_STRING
You can then map the columns in the Lookup Transform dialog.