Viltrox EF-NEX IV - Results?

[cskphotos]

I'm interested in the Viltrox EF-NEX IV.. Online selling around S$150..
Would like to ask bro/sis here if anyone have used it with these lenses? How's the AF?

1. Tamron SP 24-70mm F/2.8 Di VC USD (Canon)
2. Canon EF 50mm f/1.4
3. Sigma 35mm f/1.4 ART
4. Canon EF 100mm f/2.8 USM

Thanks.