The performance of the Hs 129 and the Il-2 are pretty similar, at least down low. As IceFire has already pointed out, the Il-2 is in fact the bigger, more powerful aircraft of the two. It's also got superior low speed performance, due to a lower wing loading, and at sea level it's slightly faster. But the Hs 129 is as tough and well armoured.
If you fly the Hs 129 with a gunpod, you spoil the performance of the aircraft quite a bit. The gondola adds considerable drag and weight, if you go against tanks, it's well worth it, but you're indeed an easy target for any fighter around. As a flying machine, I'd rate the Hs 129 superior to contemporary Il-2's without gunpods, but inferior with gunpods.
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