Had discussions about that earlier on, Raub, but generally people seem to agree it's roll is a bit porked. But the evidence given was all specualtion, and no hard data to back it up.
Wilbus showed us RAF test data of 109E-3 in comparison with SpitMkIa, but the roll speeds were measured at 400 mph speed. We couldn't find any data on more 'normal' combat speeds, preferably between 200-300mph.
Few things were pointed out, such as the natural advantage of square wingtips over pointed/round wingtips. In comaprison with the RAF where they sliced off their Spit wing tips to increase roll-speed, 109s had their wingtips rounded out after "F" versions. Logic would dictate if the pronciples are the same, the E should roll better, or at least, as good as a 109F.
Karnak also mentioned all his readings suggested the 109E rolled better than Spitfire MkIs.
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Thus the conclusion.. "evidence yet to be presented, but generally people agree on it being porked".
We don't have any more specific data except individual anecdotes...