I think it's gotten better over time.
It's in order of CVVC, Arpasing V1, Arpasing british reclist and Arpasing full reclist.
The last sample has the tone I have always been going for tbh, but I do like the tone of the second from last.
The main differences are how they've been recorded. The lesson I've learnt is to be more organised with how your voicebank is recorded. My CVVC was recorded in audacity and I was making up things as I went along. Since no CVVC already catered for british english, I used CZ's phonemes and just tweaked them to my liking.
I personally have come to a final conclusion that you can make anything work with some workarounds, like with arpasing, I used ow for my oa phoneme (again, not to be mistaken with ao), since that wasn't part of arpasing, and then for my ow sound I used an [ah uw] transition.

I plan to make a VCV english voicebank at some point, or an improved CVVC. Just so that there's variety.
Though Arpasing will still be my goto since it's easy to record, easy to use, and sounds great anyway.

UTAU comparison (CVVC, Arpasing V1, Arpasing british reclist, Arpasing full reclist)

* Made a new account to post since I ran out of minutes...lol
*Second account: 
@echo_exe_v2

MOVED TO: @hitcoder-vox
SHITPOSTS: @hitcoder-trash
i make music but that shit goes on my youtube channel.
I am the dev, voicer and manager of Tempest Ōkaminoto.
SONiKA is my favorite Vocaloid.
I love and respect all UTAULoids and will support anyone who is passionate with their UTAU endeavours.

I run the UTAU/VocalSynth discord server VoxBox: https://discord.gg/TZQycK5

-I do vocal synth stuff
-I make UST's  when I don't have music block
  -if you use my UST's let me know! I wanna see what you make from it ;)

current project:  雨シルバーACT 3
I do stuff.... sometimes

ADD ME ON DISCORD IF YA WANT!!! 
utsuWOLF#9694

fourth SC account for Morry's Illusion

Hi I am morry this is my account to post song covers and some originals....

i use Flower a lot. and made sonic/shadow utau. using vocal synths since 2015.

List of voices(some ive used in the past, i have sold since)
- v flower v4
- dex
- kaai yuki v4
- avanna
- lola
- prima
- maika
- bruno
- fukase
- sonika
- miku english v4
- oliver
- eleanor forte AI + standard
- gachapoid
- anri original
- anri arcane
- rose AI
- D-lin
- feng yi
- hayden
- mai
- natalie
- ritchy
- ryo AI
- wei shu
- yi xi
- yuma
- asterian
- saros
- solaria
- ci flower

Also:
- Gynoid Flower Talk

This is an old account. Moved to new one: https://soundcloud.com/yukitoyuki

UTAU comparison (CVVC, Arpasing V1, Arpasing british reclist, Arpasing full reclist)

HitCoder (moved, check bio)