[davidmanze]

So it looks like it will be a long story. There are huge improvements at 70mm, good improvements at 50mm, 35mm is so-so; 24mm is basically unchanged.
In the next days I'll be out for a trip, then I'll resend the lens back to the lab.
I see above suggestions to ask for a new lens... But the lens was out of warranty, so I think the only point I can stress is to ask for it to be really fixed (the repair is under warranty of course) — or eventually a refund.

 Hmm ...... you said that 35mm was so so and that 24mm was unchanged ..... does that mean not so good? .... maybe they have spent time trying to find decent alignment by lens element shimming/tilting and have been unable to make corrections across the focal range ..... 
 They're at least having a go which I suppose is something ...... 

btw,  
  Actually I did say ask for "another lens", not a new one .... given that the lens was OK optically when you sent it in for the repair issue you had with it, puts the onus on Sony because the guarantee is on the repair not the lens! .... Of course a refund would be ideal given it's not a great lens anyway.