Realistically, only the AMD FX 8350 rivals the Intel i5, performance-wise. It can beat an i5 when using all cores, but still loses at single-thread performance, even when only pitted against the i5 3330 (the lowest-end Ivy Bridge i5).
The FX 4300 and FX 4350 (AMD's most recent quad-cores) don't even come close to an i5, and are defeated even by the i3, in some situations.
There is no true AMD contender for the i7, which obliterates the FX 8350.
AMD still make great products though - their price/performance ratio is superb. Hopefully, AMD will soon have something to better rival Intel's offerings. That would be great.