Yes, he is lot more evil than Itachi. Itachi was a good guy who wanted peace and loved his brother. He just showed his evilness to his brother so he could awaken Mangekyo sharingan. Itachi was grown in war condition so he never wanted war so he had to kill his own tribe to avoid another war. But he couldn't kill his brother. He also joined Akatsuki to keep on eye on Madara. He was also assigned to capture 9 tail jinchuriki (Naruto) but he delayed his mission by saying to Kisame that 9 tailed beased should be captured last as it would unbalance the sealing, actually he didnt wanted to capture as Naruto is power of Konoha his beloved village. He also gave power to Naruto which is still yet to be shown on manga.
As for Sasuke he tried to kill his one team-mate ( Karin) , Sakura. He also want to kill all the people of Konoha. His revenge is useless, just some dark chakra built in him.
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When Sasuke was little he had a loving brother, Itachi. Itachi was forced to kill his clan, but he refused to kill his brother, the konoha elders threatened to start a war if he didn't. Itachi hated fighting but he was forced to and he pretended to be evil so his brother would be known as a hero one day after he killed itachi. Itachi never hated Sasuke , infact cared about him more than the village and his own life. After itachi lets sasuke kill him (although sasuke didnt know this.) Madarra told him why itachi assassinated the clan and that it was the senju's fault and selfishness. Now sasuke is filled with revenge and plans to destroy The hidden leaf village.
None other than these two
more than likey but we do not see any for we only see sasuke Itachi and thre farther and obito fromthe uchiah clan but it is possable
only a little. now that Tobi told him the truth (Tobi=madara uchiha) ofc he does, he was his only brother, and when he found out the truth, that itachi never stoped love sasuke, i think he regret it badly Well, he cried after hearing the truth about Itachi, and he said that he cared more about itachi than the village, and he wanted to kill danzou and so on, so I guess so.
Other than the bloodline Uchiha Sasuke and Uchiha Obito have no relation. Obito was born and died way before Sasuke was even born.