Results: 
microbenchmark shows, that  RESTEasy is in ~1.5 times faster then CXF.

CXF

$ siege -c 3 -b -i -t 1m http://localhost:8082/cxf/bench > done.log
** SIEGE 2.69
** Preparing 3 concurrent users for battle.
The server is now under siege...

Lifting the server siege...      done.
Transactions:                 254294 hits
Availability:                 100.00 %
Elapsed time:                  59.42 secs
Data transferred:              73.72 MB
Response time:                  0.00 secs
Transaction rate:            4279.60 trans/sec
Throughput:                     1.24 MB/sec
Concurrency:                    2.89
Successful transactions:      254294
Failed transactions:               0
Longest transaction:            0.03
Shortest transaction:           0.00


RESTEasy

siege -c 3 -b -i -t 1m http://localhost:8082/resteasy/bench > done.log
** SIEGE 2.69
** Preparing 3 concurrent users for battle.
The server is now under siege...

Lifting the server siege...      done.
Transactions:                 362279 hits
Availability:                 100.00 %
Elapsed time:                  59.54 secs
Data transferred:             105.03 MB
Response time:                  0.00 secs
Transaction rate:            6084.63 trans/sec
Throughput:                     1.76 MB/sec
Concurrency:                    2.84
Successful transactions:      362279
Failed transactions:               0
Longest transaction:            0.03
Shortest transaction:           0.00