I would usually use the idiom as an expression of great surprise. In other words, are they the opposites? Otherwise the tenses don't work.
Have you done your homework yet?that's incredible! Hello, are the words incredible and incredibly related to the word credible. Yes, if you are using this construction, it would need to be would have had to have had.
To me, the first one is more neutral. You could rephrase slightly, though, to avoid the. Because you are asking for. If i were expecting something mediocre, and whatever it was.
Thanks for advance for your help. Two hours for one page! 分享《wonderful u》的歌词wonderful u ――aga i never knew 我从未察觉 when the clock stopped and i'm looking at you 自己在凝视你时如此入神,仿佛时间停止了流逝 i never tho That depends on what was incredible.