[Galaxy Tab Pro 12.2, 10.1, 8.4 General] thdervenis:
Here are the results in zipped screenshots after running Geekbench on my Samsung Galaxy Tab Pro 8.4 (SM-T320).

First I did a test on the stock TouchWiz ROM (Sep 3rd, 2014 update).

Then I wiped the device and installed CM11 (M11, Oct 2014 release) , nothing else was added.

I had tweaked neither TouchWiz nor CM11 (no governors changing, no trickster mods, no nothing)

As I had empirically observed, in the Sales Force Automation app that I am developing (which is resource intensive), the stock TouchWiz ROM is faster. (I actually benchmarked it on both ROMs, see post 16 bellow)

Single-Core Test: 7.24% (TW is faster than CM11)

Multi-Core Test: 16.11% (TW is faster than CM11)

*** UPDATE for CM11 (M12) ***

When CM11(M12) rolled out I also benchmarked it with Antutu and it casts CM11 as faster than TW by a persistent 3.51% (did the test 5 times in each ROM, always by ~3,5% CM11 is faster)

Benchmarking CM11 (M11) vs CM (M12) the results are the same, not worth posting extra screenshots.

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Here are some of my thoughts after using both the stock TW ROM and CM11

I found TW better than CM11 on:

-- The Samsung Email app is far superior than the CM11 Email app

I have configured a corporate Exchange account, CM11's Email app downloads attachments as 0 bytes, I have to use 3rd party email such as "Nine - Exchange ActiveSync" or "CloudMagic" (which is cloud based) if I want to download attachments.

-- The Samsung Contacts app is far superior than the CM11 contacts app (which defaults in portrait mode and needs 3rd party app/mod to change it)

-- I cannot transfer files between my PC's Bluetooth dongle and CM11 (but I can and do transfer files via Bluetooth between the PC and the device on the TW ROM, btw files transfers between my phone and the device work both on TW and CM11 ROMs)

-- Battery drains faster on CM11 (though improved), no noticeable difference on M11/M12

-- Samsung Camera is superior than the CM11's camera (though latest Google Camera builds go on par with Samsung's one, so no problem there)

-- I use both WiFi (at home and at work) and Bluetooth (in my car and out of WiFi reach) connection to the Internet. On TW ROM the WiFi connection disables the Bluetooth connection when connectable WiFi is in range while it is the other way around on CM11.

-- Miracast works fine both on TW and CM11, transmitting the device's screen on TV. But additionally when video is playing on the device, TW transmits only the video on TV while leaving the device's screen operable for other tasks while CM11 transmits both video and the screen, as Miracast default behavior.

-- TW has built in DLNA server, running as a service, with the ability to transmit subtitles. In order to achieve that on CM11 I need to download the Pixel Media Server app (the best I found with subtitle support) which is killed by the OS when swiped off the Recent Tasks pane.

I found CM11 better than TW on:

-- No bloatware, debloatted by default (TW debloatting is always incomplete and trouble prone)

-- Uses less RAM, more active applications on the background (though not that many)

-- Much, much smoother that TW (although using Google Now Launcher on TW improved the experience)

-- Far superior Settings on CM11, the Settings are awful on TW ROM, always a pain to find what I am looking for.

-- Far superior notifications, status bar and quick access tiles on CM11

I really, really like CM11. That's the software that our device should have been shipped with, but I found Samsung's TW more rounded, more polished, more h/w compatible, more worked through than CM11.

You are welcomed to share your thoughts.

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