I think the first three posts hit the nail on the head for " most impressive " although I never fail to be amazed by the squatting of the top Olympic weightlifters .
Here's China's Tian Tao my favourite lifter from that country with an easy 302 kg at 85 kg class . He's said to be good for 320 kg .
More crazy stuff by weightlifters here Idalberto Aranda squats 300 kg for a double at 77 kg BW and in the second part hits 285 kg plus a nifty overhead finish .