iso 8859 or escape sequencies?

"TIMO HARMO" <HARMO@VALT.helsinki.fi>
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Date: Sun, 10 Apr 1994 15:29:14 --100
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From: "TIMO HARMO" <HARMO@VALT.helsinki.fi>
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Subject: iso 8859 or escape sequencies?
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Is there a reason to use the html "escape-sequencies" (&oumlaut for | 
etc.) for characters that are also in the iso 8859-1 character-set? Are 
there browswers that do not support the full iso8859 character set but 
do support the escape-sequencies?
 -Timo H