2003 not at all, 2002 and 2004 were the main seasons when there was no challenge.
1997 hes car was no where near the pace of the willaims but he managed to challenge JV right to the end.
2006 the Ferrari wasn't as fast as the Renault overall, expecially in the first half of the season, and he gave Alonso hell that year, and hes performance in monaco(even though hes quailifying antics where stupid) overtaking nearly the inter field and most of them on the track not in pit stops sums up how good of a driver he really is.
Also Imola 2006 was a good one, how he managed to get ahead of alonso after the pit stops even though hes car was much slower was amazing.