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Some tests:

Below are links for visual comparison
CRF ABR 2PASS CBR CRF-BR

Short result tables:

Located above the reference to the visual comparison...
Test source information: 640x480 @ 60.00 fps (1200 frames) (LosslessTouhou) with Complexity 746.9
Tests made by: x264.922kVAQ2mod.PsyRDO.k8.pf.exe
Patches:
All tests made only in --aq-mode 3
aqm_NOT==--aq-mode 0
cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=6 psy_rd=0.000000 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0 bframes=2 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 bime=1 keyint=600 keyint_min=60 scenecut=40 rc=crf crf=26.0 rceq='blurCplx^(1-qComp)' qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 pb_ratio=1.30

cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=6 psy_rd=0.000000 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0 bframes=2 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 bime=1 keyint=600 keyint_min=60 scenecut=40 rc=abr bitrate=3400 ratetol=1.0 rceq='blurCplx^(1-qComp)' qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 pb_ratio=1.30

cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=6 psy_rd=0.000000 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0 bframes=2 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 bime=1 keyint=600 keyint_min=60 scenecut=40 rc=2pass bitrate=3400 ratetol=1.0 rceq='blurCplx^(1-qComp)' qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 cplxblur=20.0 qblur=0.5 ip_ratio=1.40 pb_ratio=1.30

cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=6 psy_rd=0.000000 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0 bframes=2 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 bime=1 keyint=600 keyint_min=60 scenecut=40 rc=cbr bitrate=3400 ratetol=1.0 rceq='blurCplx^(1-qComp)' qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 vbv_maxrate=0 vbv_bufsize=240000 ip_ratio=1.40 pb_ratio=1.30

cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=6 psy_rd=0.000000 brdo=1 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 chroma_qp_offset=0 threads=1 nr=0 decimate=1 mbaff=0 bframes=2 b_pyramid=1 b_adapt=1 b_bias=0 direct=3 wpredb=1 bime=1 keyint=600 keyint_min=60 scenecut=40 rc=crf crf=XX.XXX rceq='blurCplx^(1-qComp)' qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 pb_ratio=1.30