Antialiasing looks like its off in several places in the latest version. Both the input text and non-highlighted results don't look antialiased, but the highlighted result does look antialiased.
If it's helpful to know, I do have the "Reduced transparency" feature enabled in the Accessibility Preferences and I am using a non-Retina screen.
Alfred: v3.8 [959]
macOS: 10.14.3 (18D109)