Also depends a little on what you're comparing it to. The equivalent elections in 2014 went pretty well for Labour already, so it's difficult to draw conclusions just yet. Also, if, as TTT says, Ukip voters mostly returned to the Tories, then that complicates the analysis too.
At 2014 the effective national vote share was something like 31% Lab, 29% Con, 17% Ukip, and 13% LibDem. I'm not sure what the equivalent figures are for yesterday but it seems likely that Labour are still coming out slightly ahead.