Gave this its own thread here:
https://forum.reallusion.com/423044/Architecture-Visualization-Render-Contest
You can download the scene from the new thread.

I'll have it posted shortly. Was out on a bike ride! ;)

the scene is with rampa already , the unique thing i ask is just to use for internal only on forum thx. 

Rampa, did you ever put up a scene to share with the community yet?
Give us the Dropbox link, let us give it a whirl!

The loft is great, but this scene is unique in that it has the stair wall to deal with. 

I think we all learn more by working on something common, as the variables are often so different for different scenes.

My suggestions would be to start with the existing materials and lighting, and then improve them as much as possible.

So adjust the light parameters, but maybe try and keep the same basic time of day for the outside light creating the shadows.
Use the existing material diffuse, but modify the material s however you wish, including adding additional textures for other channels. Basically, make it pretty! :)
Do it for fun.

my toughs about this tests is one thing i undestand already from 2 or 3 months back . 
progressive lightmap from unity or unreal lightmass are the best thing you can see on realtime engine world ( puting at side RTX ) 
BUT for story telling you dont need the lightmapping precision you need powerfullshaders for the characters . VXGI brigh in dinamic characters is better than lightprobes cause it dont have the same precision from the lightmapping on statics objects and deliver less precision than vxgi. the same happen with dinamic lights particles vfx... the fact reallusion uses HBAO+ in layer with vxgi shadows. give the user the power to get amazing results in AO side better than toolbag 3 for example. the toolbag impress with your powerfull material system and stupidy powerfull shadow system with monster soft shadows. if you get this from toolbag for iclone. will make iclone a monster realtime engine tool.at the moment my main tool for render is unity cause i have the best from both sides realtime and no realtime, plus a lot of visual resources caming from scripts make for third party users. ( this is one of the reasons me and almost no one is using HDRP cause is just incompatible ) btw. i go back from my working animations i working for my site ... cheers! :)  

Rampa?....
Wait - Rampa...Shared scene...

LOL!  That Deja-Vu'd me!

https://forum.reallusion.com/FindPost333441.aspx

the last image from this test a version from toolbag3 

eh the file is not upload... i will send it to rampa..

this was not my idea other ppl talk the same thing cause using a same scene will be more easy to point visual resources. btw. i cant upload the file on forum something happened. 

Wildstar - I have mixed feelings on this. 

PRO - you will learn from others new things that you had never considered before, and then from there you can make it part of your own approach. 
This will work so long as those making optimizations have full guaranteed ability to provide you with specific technical measurable measures they are utilizing.

CON - This is your work.  For me, I would show you MY work and ask for your input on what I can do better.  But I would NOT ask you for your scene.  I would send you MY scene and ask for your input on MY scene.  I would pay you for that input as I value the exchange. 
And look - there is always the 'Loft Scene', that everyone has access to and can try their best at.  Let others show you their work with that scene, which again, everyone has access to.  A contest doesn't need to be run with your scene.  As a user group we already have scenes ready for contest.

I always have respect for your work and your insights.  As I myself have been approached and been now more involved in professional interactions, I find that serious interest is handled in a professional manner. 
But, the forum is a free exchange of ideas always, so this is just my specific opinion on this topic and doesn't have to be yours or anyone else's.