Yes, I believe they really are that remarkable. None of three original were particularly good singers; their acting was strong, but they were chosen for their dancing abilities.
The Matildas are better singers, despite being younger, and have acted circles around many adult performances I've seen this year.
I liked Billy Elliot a lot and enjoyed the performances of the three winners, but I think the four Matildas are wildly good. Maybe the best child performances I've seen.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!