1Weingut Grans Fassian Piesporter Goldtropechen Spatlese
Riesling, and especially Piesporter should not have any oak (or oak flavoring for that matter), what-so-ever.
A good Piesporter Spatelese should smell peachy, with tropical notes, it should be pleasantly off dry to mildly sweet and display some minerality too. Great one's have a vibrant acidity that keeps them fresh and lively. This is a style of wine that has had varrying degrees of popularity over the years stretching back to the middle ages. There are some really spectacular examples to be had out there. Keep tasting.