I've owned both and I definitely miss having the 6D II. There's a great comparison video by Jamie Windsor on YouTube. Essentially the only advantages to the 5D are 1) dual card slot, 2) silent shooting mode and 3) Magic Lantern.
Key Specifications; Canon EOS 6D Introduction (i.e. the 1D Mark II and 1Ds Mark II), Canon’s decision to launch it for under £2k also put it within range of the well-heeled enthusiast
EOS RP. A7 II. The A7 mark II has a larger viewfinder than the EOS RP (0.5-in vs 0.39-in) but the magnification factor is very similar (0.71x on the Sony and 0.7x on the Canon). The resolution is the same (2.36M dots) and so is the 22mm eye point which is decent for someone wearing glasses.
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canon 6d mark ii video specs