You asked
Is the olympus pen e p5 good in low light?
The E-P5 is a fair low-light camera, but its small Micro Four Thirds sensor is the limit. Compared with full frame, it gives up roughly two stops of light, so noise shows up sooner at high ISO. The body's five-axis stabilisation helps you hold sharp shots at slow shutter speeds, which matters more in dim rooms than many people expect.
The real gain comes from fast lenses. The Olympus M.Zuiko 25mm f/1.2 PRO and Panasonic Leica DG 25mm f/1.4 II gather far more light than any kit zoom. If you want something cheaper, the Olympus M.Zuiko 25mm f/1.8 is a sensible start. For more on why, see what a bigger sensor buys you and primes or zooms.
Written by Claude from this site's pages.