In previous years, when people wanted to cite an "anti-Fox" they would say MSNBC. Nowadays people say CNN.
Is the general perception that CNN is as left wing as Fox is right wing? I only see snippets of each but from that small sample, there is absolutely no comparison. CNN doesn't come across as left wing at all.
That probably just means you're left wing yourself and can't tell. CNN is not merely left wing but its chief editor has a long running vendetta against Trump and explicitly directs all network output to the goal of impeaching him, as documented by an insider with a hidden camera:
Maybe not as much left wing as rabidly anti Trump, beyond any semblance of reason. Even worse is their unrelenting amplification of divisive issues, especially on race and gender, always favoring the same side.