About Azure Table Storage Row 1MB Limit, How it counts for UTF8 Code?

Lets first quote:

Combined size of all of the properties in an entity cannot exceed 1MB. (for a ROW/Entity) from msdn

My Questions is: Since everything is XMLed data, so for 1MB, is 1MB of what, 1MB of ASCII Chars, or 1MB of UTF8 Chars, or something else?

Sample:

Row1: PartitionKey="A', RowKey="A", Data="A"
Row2: PartitionKey="A', RowKey="A", Data="Ａ"  (this is a UTF8 unicode A)

Is Row1 and Row2 same size (in length), or Row2.Length=Row1.Length+1?