At the moment no, but like so many others have said we still don't know the actual affects of the oil spill yet. As of writing this post (8:24 PDT) BP has yet to cap the well, and oil is still gushing into the Gulf.
As for long term affects, if you want more info for Chernobyl I suggest the following sites:
http://www.who.int/ionizing_radiation/chernobyl/en/
and
http://www.unscear.org/unscear/en/chernobyl.html
Both are sites from the UN and contain THOUSANDS of pages of information on the incident.
Conservative estimates say that the farmland around Chernobyl will be unusable for 200 years (I'm getting that figure from the WHO report available at the first link)
We haven't even gotten into the fact that radiation from Chernobyl has been shown to increase cancer risks, especially those of the thyroid, by statistically significant amounts.
On the other hand if you go to the shores of Alaska and dig a down on the shores where the Exxon Valdez ran around, you can still find significant amounts of oil even after 20-some years.
Comparing the two is unrealistic in the endgame however as the affects are wildly different.