One useles comparison. I will compare the fastest time of a team from today, to the fastest time of testing last year (all days).
Ferrari: -1:16.221+1:18.289= +2.067
Mercedes: -1:16.224+1:16.976= +0.752
Renault: -1:16.843+1:17.873= +1.030
Toro Rosso/AT: -1:16.882+1:17.698= +0.816
McLaren: -1:16.913+1:17.842= +0.929
Haas: -1:17.076+1:18.466= +1.390
Red Bull: -1:17.091+1:17.516= +0.425
Alfa Romeo: -1:17.239+1:18.386= +1.147
Racing Point: -1:17.556+1:17.375= -0.181
Williams: -1:18.130+1:18.168 = +0.038
So, the only car that is faster is Racing Points W10, and the other car that is really close is FW43.