You asked
Is the fujifilm x e2s good in low light?
Here is what the site says about that.
From Fujifilm X-E2S: Fujifilm X-E2S: A mirrorless camera by Fujifilm with a 16.3-megapixel APS-C sensor, announced in 2016. Specs - Maker: Fujifilm - Mount: Fujifilm X - Sensor: APS-C, 23.5 x 15.6mm, crop factor 1.5 - Resolution: 16.3 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: 2016 - Type: mirrorless camera Focal lengths on it Lenses frame like 1.5 times their focal length on full frame: 16mm ...
From Sensor sizes: Is full frame worth it?: For low light, events, and portraits with very shallow depth of field, yes. For travel, street, wildlife on a budget, and most hobby photography, a good APS-C camera with good lenses is enough, and you'll carry it more. Lenses and light matter more than the last stop of sensor performance.
Quoted from this site's pages.