Wikipedia has 3 but they don't have Carmona.
Wendy Carillo (Standing Rock and Fight for 15 activist and radio host)
Jimmy Gomez (state assemblyman)
Sarah Hernandez (former teacher and nonprofit leader)
They also have a Green party candidate:
Kenneth Mejia (activist) (Mejia is also a Bernie supporter)
That means 3 out of 5 candidates are vocal Bernie supporters. I'm not sure where the other two candidates stand.
Without knowing anything about them, Gomez and Hernandez seem like the best. I don't trust candidate with the main title "activist".
That's not a good argument and you know it
It sounds however that Carmona would have an early advantage. I did a little research and it looks like Carillo has an online following so that might help her. She was also at Standing Rock and is active on all the important issues of our days. She's also a good writer judging by some of her articles I found so I suspect she will be a good speaker too.
Carmona on the other hand, having worked for the Bernie campaign probably has a bigger following and since a lot of Bernie supporters are trying to find campaigns worth working for, he could probably make good use of them. Gomez, I couldn't find anything about, even though he's an assemblyman.
We'll see who wins, but I'm glad we will have a fresh face with new ideas. Becerra was not bad or anything, but he had been in the House forever and the Democrats need new blood.