So far this winter in Riga temps were down as low as -23 Celsius (-9.4 F).
For the last 3 weeks Riga hasn't seen a day with temperatures above freezing.
Mostly it stays around -5 up to -10 during the day and drops to -10 or -15C during the night.
A proper winter.

First Eucalyptus gunnii. I planted 4 plants. 2 in my garden, the other two in various places in Riga.
So far one of them without any protection is doing well. The protected one seems fine as well.
Little to no leaf damage.

Elaeagnus x ebbingei
This is the biggest surprise, because I didn't expect it to last one bit.
I couldn't seen any significant leaf damage.

My cacti - I think Opuntia. I gave it a bit of protection from rain and sleet.
Doeasn't look too bad.

Viburnum davidii
This is not from my garden, but it does extremely well. Some Rhodies at the background.

Ligustrum, it seems that it does drop some leaves, but not all of them.

Mahonia in an inner block of a city - doesn't suffer from freezing temps.

Cotoneaster dammeri
Does drop some leaves, but stays green all winter long.

Prunus Laurocerasus Novita.
Some lower leafs are brownish, top leafs are slightly better.