I decided to take a few very quick portraits with the Fujifilm XT20,Voigtlander 58mm f1.4 and a LightPix Labs flash (manual only no TTL so all the settings must be set physically. The flash was bounced off the ceiling and the shutter speed was 1/125, aperture was f2.8 and ISO 1000. I use auto-ISO on Fujifilm cameras as you can program the minimum and maximum across 3 custom settings. Flash setting were at 1/16. No face tracking was available as its manual focus, however I did you focus peaking with the red option. And yes, children move and it takes some time and skill to nail focus.
Below are a series of colour and B&W shots. All were shot RAW in LR so no simulations were used, except for the first B&W which was ACROS + G filter. Click on photos for bigger. Enjoy.