Help me choose a new camera please

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I am a photographer of 4 years who shoots with a 60d, I shoot primarily people for newspaper shots, coverage of events as a freelancer, and real estate.

I am pushing my camera to the max and need to upgrade and im considering either a 6d or 7dmark 2.

I shoot in a lot of dark places so i need to get better light performance, Im leaning towards a 6d but one thing that concerns me is the focusing issues i hear about, are they true. Also i am not sure if my lenses will work on the 6d.... heres my gear below...

All are Canon official lenses, no 3rd party
17-40 f4 lseries
24mm 2.8
50mm 1.4
85mm 1.8
10-22mm lenses(use this for realty, but 6d will not work with it right and why?)

canon 430 exII with a rogue flashbender softbox kit i use attached on camera

Also have a gary fong i use sometimes

[EXIF data available. Click here to show/hide.]

Camera-Specific Properties:
Equipment Make	Canon
Camera Model	Canon EOS REBEL T3i
Camera Software	Adobe Photoshop Lightroom 6.3 (Windows)
Maximum Lens Aperture	f/3.8
Image-Specific Properties:
Horizontal Resolution	300 dpi
Vertical Resolution	300 dpi
Image Created	2015:12:31 13:23:43
Exposure Time	1/160 sec
F-Number	f/8.0
Exposure Program	Manual
ISO Speed Rating	100
Lens Aperture	f/8.0
Exposure Bias	0 EV
Metering Mode	Pattern
Flash	No Flash, Compulsory
Focal Length	13.00 mm
Color Space Information	sRGB
Rendering	Normal
Exposure Mode	Manual
White Balance	Auto
Scene Capture Type	Standard