Based on your suggestions I tried both:
\ssh -X -vvv p...@remotehost -p8080 'evince' 2>/tmp/ssh.log

and

\ssh -X -p8080 -vvv p...@remotehost 'evince' 2>/tmp/ssh.log

Each of these did not display the evince GUI and returned the following:
grep -i -e x11 -e port /tmp/ssh.log
Hmm, for some reason port 8080 is not recognized.
-------------------------------------------------------------------------------------------

debug1: Connecting to remotehost [remotehost] port 8080.
debug3: put_host_port: [remotehost]:8080
debug3: put_host_port: [remotehost]:8080
debug2: x11_get_proto: /usr/bin/xauth  list remotehost:0.0 2>/dev/null
Warning: No xauth data; using fake authentication data for X11 forwarding.
debug1: Requesting X11 forwarding with authentication spoofing.
debug2: channel 0: request x11-req confirm 0
debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from 127.0.0.1 41008
debug2: connect remotehost port 6000: No route to host
connect remotehost port 6000: No route to host
debug1: failure x11

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