  We perform a comprehensive statistical analysis of the standard model (SM)
with three and four generations using the latest Higgs search results from LHC
and Tevatron, the electroweak precision observables (EWPOs) measured at LEP and
SLD and the latest determinations of M_W, m_t and alpha_s. For the
three-generation case we analyse the tensions in the electroweak fit by
removing individual observables from the fit and comparing their predicted
values with the measured ones. In particular, we discuss the impact of the
Higgs search results on the deviations of the EWPOs from their best-fit values.
Our indirect prediction of the top mass is m_t=175.7(+3.0)(-2.2) GeV at 68.3%
CL, in good agreement with the direct measurement. We also plot the preferred
area in the M_W - m_t plane. The best-fit Higgs mass is 126.0 GeV. For the case
of the SM with a perturbative sequential fourth fermion generation (SM4) we
discuss the deviations of the Higgs signal strengths from their best-fit
values. The H -> gamma gamma signal strength now disagrees with its best-fit
SM4 value at more than 4 sigma. We perform a likelihood-ratio test to compare
the SM and SM4 and show that the SM4 is excluded at 5.3 sigma. Without the
Tevatron data on H -> b bbar the significance drops to 4.8 sigma.
